How to make a magnifying glass at home. DIY converging lens. Maximum magnification and zoom quality

Instructions

To build lens Fresnel You yourself need to have a significant understanding of optics. So, unlike conventional lenses, fresnel does not consist of solid glass, but of concentric rings with a cross-section special form prisms. Make calculations and determine zone boundaries Fresnel. They are determined by the intersection of the wavefront of the original wave with a sequence of wavefronts of the “projected wave” shifted relative to each other by l/2.

Make clear rings to cover odd-numbered areas Fresnel. Their thickness must correspond to the additional phase shift l/2. For convenience, use the drawing.

To achieve the greatest effect, coat the ends of each prism with a coating, for example, aluminum. Articulate the structure by checking the position of the prisms using the equation.

There are two types of lenses Fresnel– ring and belt. Unlike ring lenses, which direct the light flux in a strictly defined direction, waist lenses distribute light from the source in all directions. At the lens Fresnel The scope of application is very diverse: from marine beacons and photographic lenses to a special film that is applied to the rear window of a car to reduce the blind spot behind the car when using the rear-view mirror.

Simultaneously with the creation of the lens O.Zh. Fresnel developed the most complex technology for its production. In a nutshell, we are talking about making a lens consisting of a set of several prisms in the form of thin rings. IN modern conditions such production is possible only with the use of modern high-precision processing, vacuum-spraying and control-measuring equipment.

In the production of lenses Fresnel HOTLENS technology uses holography, thanks to which infrared radiation is more accurately focused and the ingress of, for example, visible light is reduced. Such lenses make it possible to create a more accurate detection zone in space. A set of technological equipment for the production of lenses Fresnel includes precision lathes, which carry out trimming and preliminary rounding of workpieces. Sphero-lathes process external and internal surfaces lenses

The most important stage– grinding the surface of the lens. It is carried out on polishing machines. The polishing process simultaneously removes roughness and improves the cleanliness of the spherical surfaces of the lenses. The edges of the lenses are polished on special machines, and special diamond cutters are used to process the concave and convex surfaces of the lenses. In addition, all necessary technological equipment is manufactured at such enterprises.

A lens is a transparent device, mostly made of special glass, designed to magnify an image. The lens is the main part of any optical system. The principle of its operation is based on the refraction of light rays. Make glass lens using a homemade method is very difficult, especially without necessary equipment there is no way around this matter. But based on the effect of light refraction, we can do lens liquid based.

You will need

  • Plastic bottle, plasticine, glycerin or water, syringe with needle, plastic bag.

Instructions

Take a one and a half liter plastic bottle. From the top of this bottle, cut out two identical, convex circles (for convenience, cut out one circle first, and then cut the second one according to its diameter).

Then, take ordinary plasticine or some other sticky material. Use this plasticine to glue both halves of the lens so that it is convex on both sides.

After this, make holes in two places between the halves of the lens. Fill one of these holes with a syringe using a syringe (you can fill it with ordinary water, but it is better to use a liquid with a high refractive index, try filling lens glycerin, the effect will be better), fill it to the brim and there should be no air bubbles in it. The second hole is designed to allow air to escape so that pressure does not build up. After filling the lens with liquid, seal the holes.

IN extreme conditions, for example, being in the taiga in winter, without matches, you can make lens for making a fire. To do this, take an ordinary plastic bag and fill it with water. Shape the bag into a ball and let the water freeze. Once frozen, tear off the bag to create a lens. The lens can also be cut out of frozen ice.

Good light in the car - the most important parameter security. Modern technologies are developing at the speed of a spaceship and the solutions used 5 years ago today already look hopelessly outdated. It is not profitable for automakers to update old products, but third-party developers actively support this topic. To improve the design and luminous flux, it is proposed to install lens into the reflective design of the headlight.

You will need

  • - lenses;
  • - industrial dryer;
  • - Screwdriver Set;
  • - gloves;
  • - plastic and soldering iron

Instructions

First remove and completely disassemble headlight on your car. When removing headlights, follow the repair instructions. To disassemble the headlight, warm it up with an industrial low heat.

The Fresnel lens is almost the very first, according to historical chronology, device, the basis of which is the principle of light diffraction. Despite the age of this invention, it has not lost its relevance today and has found application in many areas.

What is a Fresnel Lens

A Fresnel lens is a complex compound lens. Unlike ordinary lenses, it does not consist of a single ground piece of glass with a spherical surface, but of individual concentric rings. They are closely adjacent to each other and have small thickness. In cross section they are prisms special profile. This type of lens got its name from the French physicist Augustin Fresnel, who proposed it, who worked in the field of physical optics.

Thanks to its unique design, this lens model is lightweight and thin. The sections of its rings are constructed in such a way that its spherical aberration is extremely small, as a result of which the rays refracted by it emerge as a single parallel beam. The diameter of the Fresnel lens varies from a couple of centimeters to several meters.

Fresnel lenses are usually divided into ring and belt. The first direct a beam of light in one predetermined direction. The latter send light from the source in all directions in one plane.

Application of Fresnel Lens

Today, the Fresnel lens has found wide application in many fields.

For example, they are used in large lighthouses, projection televisions, navigation lights, railway lens traffic lights and semaphore lights. And due to its low weight, the Fresnel lens is also used in lighting devices that need to be moved during operation.

And when placed on the rear window of a car in the form of a thin film, it significantly reduces the “dead” zone behind the car, as seen in the rearview mirror.

An ultra-flat, lightweight magnifying glass is created based on the Fresnel Lens. It is her help that people with low vision resort to when reading texts in small print.

In addition, similar lenses are used in infrared motion sensors and lens antennas.

There are a couple more promising areas in which the Fresnel Lens can be used. Its use is presumably possible in the construction of space telescopes of gigantic diameters.

It is also likely to be used as a solar energy concentrator for solar panels.

Sources:

  • Simple about science

How to make a lens?

If you don’t have a lens at hand at the right time, don’t be upset, as you can make one yourself very quickly. To do this, you need to study the recommendations on how to make a lens with your own hands.

Plastic bottle lenses

IN in this case let's try to do it biconvex lens. During the work you will need:

  • paper;
  • plastic bottle (preferably transparent);
  • scissors;
  • plasticine/clay;
  • tubes;
  • water.

Manufacturing

You can also use an ordinary syringe instead of tubes and use it to fill the lens with water. In this case, insert the syringe needle on one side and gradually fill the lens with water, and on the opposite side you need to make a hole for air.

Ice Lens

If you are in a cold area and don't have a bottle or materials at hand, you can make a simple optical lens using ice. To do this, fill a bag with water and place it in a cool place (preferably in freezer). As it hardens, give the lens a flattened shape. After the water in the bag turns into ice, the lens can be used.

The next thing to consider is processes production of contact lenses. IN modern world, there are three main methods for manufacturing these simple devices.

The oldest method currently used is centrifugal formation. A liquid polymer is injected into a mold spinning at high speeds, where it is instantly exposed to ultraviolet radiation and high temperature, resulting in fairly rapid hardening of the material.
Next, the prepared contact lens is removed from the mold and saturated with water, this stage is also called hydration. Afterwards it is polished, tinted and thoroughly chemically cleaned.

There is also such a way lens manufacturing, as turning - it is used in the manufacture of soft and hard, more often called hard, contact lenses. To do this, workpieces are used from a pre-polymerized substance, after which they are processed on a lathe. Then these lenses are carefully polished, saturated with water, chemically cleaned from all foreign impurities, and tinted. The final stage of the process is sterilization, where the lens is heated to 121°-124° C. After which the contact lenses should be packaged and labeled.

Another popular method production of contact lenses- this is casting. It is the least labor-intensive of the above methods. All that is required is a metal matrix form; it should be taken into account that for each type of lens, with certain parameters, it is individual. Thousands of plastic copies are cast using this matrix. The lower part of each mold is filled with liquid polymer and inserted on top top part shape, this acts as a kind of press. In the space between the two halves of the form, our lens is obtained. Next, the contact lens is saturated with water, then polished, cleansed, tinted, sterilized, and packaged, as in all previously discussed cases.

It should be noted that there are also combined manufacturing technologies that are often used in the production of lenses. The most common example combined method, can be called Reversible Process III. Its essence is based on the fact that back The lenses are formed by turning, and the front lenses are produced by centrifugal molding.

There are quite a few similar techniques. Each manufacturer focuses on efficiency, speed and ease of production, and has the right to choose any of the listed technologies, introducing their own subtleties and wishes, inventing new and new methods. Progress does not stand still, we can be absolutely sure that in the near future, the production of contact lenses will reach new level, making our vision perfect, our gaze natural and beautiful, and us - more successful and more self-confident.

A telescope is a device that receives electromagnetic radiation from distant objects and brings it into focus to produce a magnified image. The most important part of it is the lenses. To make a simple working telescope, you can buy them at any optics store or make it yourself.

You will need

Window glass;
- tubular drill;
- coarse abrasive;
- Metal sheet;
- plasticine;
- balsam.

Posting sponsor P&G Articles on the topic “How to make your own lenses for a telescope” What is a telescope How to make the simplest amplifier How to make a homemade antenna for a 3g modem

Instructions


Place the glass sheet on a flat board and secure it with three wooden strips so that they form an equilateral triangle. Nail the ends of the planks to the table. Insert a tubular drill bit into the triangle formed. Drill through the glass using coarse sandpaper. Wet the drilling area generously with water so that the abrasive gradually falls into the recess. To prevent chips from forming when the drill comes out of the glass, back side glass is glued with hot resin to a sheet of metal 3 mm thick. To prevent water from spreading on the glass, make a low plasticine side. When cutting, rotate the drill bit vigorously from side to side. Make a step grinder from bronze, brass or other metal. Grind the lens on a turntable, having previously secured the workpiece in a special mandrel. Pre-grind the convex lens using an emery wheel. Start sanding with M40 micropowder. Having smoothed out the unevenness after peeling, change the powder to M20, and after 20 minutes - to M10. After sanding, polish the product. Form a polishing pad from the hardest resin. While polishing, let the resin cool every 3 minutes and form a polishing pad on the lens to polish the flat side of the lens. Glue achromatic lenses with Canada balsam or balsam. Place the pieces of balm in a test tube and place it in a metal mug with water. When the water boils, the balm is ready for use. 11 Place a board a few millimeters thick on the burner, turned on low. Place the lenses on it and heat them to 70? C. 12 Place a drop of balm on the concave surface of one lens, place it on the second lens and squeeze them tightly. 13 When the balm spreads over the surface to be glued, let the lenses cool. Remove excess balm with a knife, wipe the lens with turpentine, wash with soap and wipe with alcohol. Before the alcohol dries, rinse it with water. Place the finished lens in the frame. How simple

Other news on the topic:

A telescope is optical instrument in astronomy, which is intended for the study and observation of starry sky. The cost of such a device ranges from $250 and above. If you do not have the means, but want to have a telescope at home, then you can easily make it yourself. To you

The one who has been wearing for a long time contact lenses, won’t even remember what it’s like to not be able to put them on? Everything is so simple that, over time, the process becomes automatic and routine. Like brushing your teeth or making tea. But beginners are always calmer if there are clear recommendations. To you

Eyeglass lenses are a good material for a high-quality telescope. Before you buy a good telescope, you can make one yourself from inexpensive and available funds. If you or your child want to get interested in astronomical observations, then the construction homemade telescope will help you study theory optical devices, and observational practice.

Despite the fact that a refracting telescope built from spectacle glasses will not show you much in the sky, the experience and knowledge gained will be priceless. Afterwards, if you are interested in telescope construction, you can build a more advanced reflecting telescope, for example Newton’s system (see other sections of our website).



There are three types of optical telescopes: refractors (a lens system as a lens), reflectors (a lens - a mirror), and catadioptric (mirror-lens). All modern largest telescopes are reflectors; their advantage is the absence of chromatism and possible large sizes lens, because the larger the diameter of the lens (its aperture), the higher its resolution, and the more light is collected, and therefore the fainter astronomical objects are visible through the telescope, the higher their contrast, and the greater magnifications can be applied.

Refractors are used where necessary high accuracy and contrast or in small telescopes. And now about the simplest refractor, with a magnification of up to 50 times, with which you can see: the largest craters and mountains of the Moon, Saturn with its rings (like a ball with a ring, not a “dumpling”!), bright satellites and the disk of Jupiter, some stars invisible to the naked eye.



Any telescope consists of a lens and an eyepiece; the lens builds a magnified image of the object that is viewed, then through the eyepiece. The distance between the lens and the eyepiece is equal to the sum of their focal lengths (F), and the magnification of the telescope is equal to Fob./Fok. In my case it is approximately 1000/23 = 43 times, i.e. 1.72D with an aperture of 25 mm.

1 - eyepiece; 2 - main pipe; 3 - focusing tube; 4 - diaphragm; 5 - tape that secures the lens to the third tube, which can be easily removed, for example, to replace the diaphragm; 6 - lens.

As a lens, let's take a blank lens for glasses (can be bought at any "Optics") with a power of 1 diopter, which corresponds to a focal length of 1 m. Eyepiece - I used the same achromatic coated gluing as for the microscope, I think for such a simple device - this is a good option. As a body, I used three tubes made of thick paper, the first about a meter, the second ~20 cm. The short one is inserted into the long one.



The lens - the lens is attached to the third tube with the convex side facing outwards, a disk is installed immediately behind it - a diaphragm with a hole in the center with a diameter of 25-30 mm - this is necessary, because a single lens, and even a meniscus, is a very bad lens and for obtaining of tolerable quality, you have to sacrifice its diameter. The eyepiece is in the first tube. Focusing is done by changing the distance between the lens and the eyepiece, moving the second tube in or out, focusing conveniently on the Moon. The lens and eyepiece must be parallel to each other and their centers must be strictly on the same line; the diameter of the tube can be taken, for example, 10 mm larger than the diameter of the aperture hole. In general, when making a case, everyone is free to do as they wish.

A few notes:
- do not install another lens after the first one in the lens, as advised on some sites - this will only cause light loss and deterioration in quality;
- also do not install the diaphragm deep in the pipe - this is not necessary;
- it’s worth experimenting with the diameter of the diaphragm opening and choosing the optimal one;
- you can also take a lens of 0.5 diopters (focal length 2 m) - this will increase the aperture opening and increase the magnification, but the length of the tube will become 2 meters, which may be inconvenient.
A single lens is suitable for the lens, the focal length of which is F = 0.5-1 m (1-2 diopters). It's not difficult to get; it is sold in an optical store that sells glasses lenses. Such a lens has a whole bunch of aberrations: chromaticism, spherical aberration. Their influence can be reduced by using lens aperture, that is, reducing the entrance aperture to 20 mm. What's the easiest way to do this? Cut a ring out of cardboard equal to the diameter of the pipe and cut the same entrance hole (20 mm) inside, and then place it in front of the lens almost close to the lens.



It is even possible to assemble a lens from two lenses in which the chromatic aberration that appears as a result of light dispersion will be partially corrected. To eliminate it, take 2 lenses of different shapes and materials - collecting and diverging - with different dispersion coefficients. A simple option: buy 2 spectacle lenses made of polycarbonate and glass. In a glass lens the dispersion coefficient will be 58-59, and in polycarbonate it will be 32-42. the ratio is approximately 2:3, then we take the focal lengths of the lenses with the same ratio, say +3 and -2 diopters. We add these values ​​and get a lens with a focal length of +1 diopter. We fold the lenses tightly; the collective should be the first to the lens. If it is a single lens, then it should have the convex side facing the object.

How to make a telescope without an eyepiece?! The eyepiece is the second important part of the telescope; we would be nowhere without it. It is made from a magnifying glass with a focal distance of 4 cm. Although for the eyepiece it is better to use 2 plano-convex lenses (Ramsden eyepiece), setting them at a distance of 0.7f. The ideal option is to get the eyepiece from ready-made instruments (microscope, binoculars). How to determine the magnification size of a telescope? Divide the focal length of the lens (for example, F=100cm) by the focal length of the eyepiece (for example, f=5cm), you get 20 times the magnification of the telescope.

Then we need 2 tubes. Insert the lens into one, and the eyepiece into the other; Then we insert the first tube into the second. Which tubes should I use? You can make them yourself. Take a sheet of whatman paper or wallpaper, but be sure to have a thick sheet. Roll the tube to fit the diameter of the lens. Then you fold another sheet of thick paper and place the eyepiece (!) tightly into it. Then insert these tubes tightly into each other. If a gap appears, wrap the inner tube in several layers of paper until the gap disappears.

Now your telescope is ready. How to make a telescope for astronomical observations? You're just blackening out internal cavity each pipe. Since we are making a telescope for the first time, we will use a simple method of blackening. Just paint the inside of the pipes with black paint. The effect of the first telescope created independently will be stunning. Surprise your family with your design skills!
Often the geometric center of the lens does not coincide with the optical center, so if you have the opportunity to have the lens sharpened by a specialist, do not neglect it. But in any case, an unground spectacle lens blank will do. Lens diameter of great importance does not exist for our telescope. Because spectacle lenses are highly susceptible to various obberations, especially the edges of the lens, then we will aperture the lens with a diaphragm with a diameter of about 30 mm. But to observe different objects in the sky, the aperture diameter is selected empirically and can vary from 10 mm to 30 mm.


A lens is a necessary tool in everyday life. Probably the most indispensable optical device. Telescopes, microscopes, cameras, magnifiers, and the like use lenses. Some people cannot even see normally without them, so they wear glasses, which also consist of lenses. This is the importance of lenses in our lives. In this case, lenses are divided into two more types: diverging lenses and converging lenses. For example, diverging lenses are worn by people with myopia, and converging lenses are worn by people with farsightedness. And these two types are divided into several more types. But let's not talk about theory, let's move on to practice. In this article, I will show you and tell you how to make a converging lens yourself at home from the most readily available materials, which every home definitely has. And so, to make a homemade collecting lens we will need:

Tools:
1) Sharp stationery knife,
2) Sharp needle,
3) Scissors,
4) Glue gun and hot glue,
5) Medical syringe.

Materials:
1) A transparent plastic bottle from some kind of lemonade or other drink,
2) Water.

The process of making a collecting lens with your own hands.

We take any plastic bottle, the most important thing is that the bottle must be transparent.

Now we will need a round-shaped object, in my case it is a lid from the plastic bottle. The good thing about it is that it's big. Other bottles have small caps, so they will not fit, otherwise the collecting lens will be very small. We insert the cap onto the bottle and trace it with a sharp needle, it is important that the circle scratched with the needle remains on the bottle. However, this action can be performed with a felt-tip pen or marker. But you just need to be careful not to smear the future lens with the paint of a felt-tip pen or marker. And then the circle must be convex, otherwise you simply won’t be able to make a lens.

You will get a circle like this.

Using scissors or a stationery knife, cut out this circle along the contour.

Using exactly the same actions, we make another exactly the same circle.

Now glue them to each other using hot glue. But at the same time, you need to leave a small hole in order to pour water into the resulting lens.



Using a syringe, fill the lens with water. To prevent life from appearing inside the lens, it must be boiled and salted. However, this is not necessary. After filling the lens with water, close the remaining hole with hot glue.

This is what my resulting lens can do. It magnifies quite decently, but is visible blurry.

A lighted magnifying glass is, of course, most needed by forensic scientists studying fingerprints. It is also needed for children who are interested in wood burning. But it can be very useful for you and me in everyday life. As is known, according to current legislation helpful information information about the product must be printed on its packaging.
But you probably noticed that it is printed in small print (especially if this information is undesirable for the seller or manufacturer).

How to make a magnifying glass with LED light

An illuminated magnifying glass will help you easily read the instructions for any medicine, the inscription on any package, or the intentionally small print of a credit or insurance agreement. It allows you to read small but necessary text in any conditions, for example, in a dimly lit store or in a gateway.

The good thing about backlit text is that it is perceived as having more contrast, so your eyesight doesn’t strain or get tired when reading for a long time.

An illuminated magnifying glass helps men with soldering and repair work with small parts, women with searching for small pieces of jewelry that have fallen out of a dark entrance, and children with studying insects, philately, and working with microcircuits.

That’s why we suggest you make such a backlit lamp with your own hands.

Preparing materials:

– 8 white SMD PLCC LEDs;
– 8 SMD resistors (size 0805 or 1206) 100 Ohm each;
– regular magnifying glass;
– a printed circuit board cut in the shape of a ring from a foil blank (according to the size of a magnifying glass);
– battery compartment for AA batteries (for 4 places);
– 4 batteries;
– Moment glue;
– connecting stranded wires of two insulation colors – one meter of wire of each color;

– wire cutters;
– soldering iron and solder;
– Dremel with cutting wheel;
– a drilling machine with large diameter drills.

Designing an illuminated magnifying glass

First, we prepare the printed circuit board to which the LEDs will be soldered. It should consist of two concentric rings separated from each other. The inner diameter of the ring plate should be equal to the diameter of lens A, and the outer diameter should be equal to the diameter of the lens frame B.

Such a board can be cut from copper foil on a milling machine. But you can also do it manually - using a Dremel and a drilling machine.

Now let's prepare the LEDs. We have white SMD LEDs in PLCC housing. The size of the LEDs does not matter - any one will do: 0805. or 1206. Let us only take into account that it is easier to solder large LEDs. It’s the same with resistors: it’s more convenient to solder resistors in large cases. Solder a resistor to the positive terminal of each of the 8 LEDs at a right angle, as shown in the photo.

We mark eight equidistant positions along the edge of the ring board and solder a pair of LED-resistor at each mark, as shown in the photo. To ensure that soldering occurs without unnecessary heat and without fuss, we first tin the soldering areas with tin. Having soldered each LED-resistor pair, use a multimeter to check whether the LED lights up. This way we make sure that the LEDs were not damaged during the soldering process.

Having carefully aligned the board with soldered LEDs, we glue the LEDs outward to the lens frame from the lens side (we use Moment glue). We solder lead wires of different colors to the inner and outer rings.

Now we connect a current source to the copper strips of the ring board: we solder the negative terminal from the battery compartment to the inner concentric ring, and the positive terminal to the outer one. You can also include a switch in the circuit, although to turn off the device you can simply remove the battery.

Magnifying glass - is it necessary in principle in everyday life, is it worth spending time on making it? There are a wide variety of lenses available for sale. But sometimes you want to make something with your own hands. Sometimes it happens. You probably read “ Mysterious Island"Jules Verne. I never wanted to repeat the experience of Cyrus Smith, who made a wonderful magnifying glass from a watch. In essence, this simple device saved the lives of the colonists. Intrigued? Then now we will tell you how to make a magnifying glass at home. Let's consider several ways.

From a plastic bottle

You will need:

  • A bottle made of transparent (not colored!) plastic with a semicircular top, without relief.
  • Scissors.
  • Two-component epoxy glue or “Superglue”.
  • A roll of electrical tape. This will serve as a template for the magnifying glass.
  • Marker.
  • 20 ml syringe with needle.

The procedure is as follows:

  1. Cut off the top of the bottle with scissors. This is exactly what you will need in your work.
  2. Using an electrical tape template, cut out two identical convex circles. These are the two halves of the future lens.
  3. Connect two circles and glue the joint with epoxy glue or “Superglue”.
  4. Place the workpiece in water. This is necessary in order to check the tightness of the structure. Small bubbles will appear in the unsealed areas. Mark these areas with a marker and then seal them.
  5. Make a hole with a syringe needle.
  6. Fill the space between the two plastic shells with salted water.

Important! You can use regular tap water, to which a little bleach is added. This is necessary so that the water does not deteriorate and turn green over time.

Magnifying glass is ready! Tested: it is no less convenient to use than a regular store-bought lens.

Giant Lens

But this is a truly valuable acquisition for the amateur astronomer. A magnifying glass of this size is quite expensive. And you can make it using two glass frying pan lids. It often happens that the non-stick coating wears off over time, and the frying pan is safely disposed of. And the lid, which looks quite decent, can be used to make a magnifying glass with your own hands.

So, you will need:

  • 2 glass lids of the same diameter.
  • Stationery knife.
  • Silicone sealant.
  • Wire cutters.
  • 8mm drill bit.
  • Medical syringe and 2 needles for it.

Operating procedure:

  1. To begin, remove the handles from the lids, the metal rim around the edge of the product, and the metal from the steam release valve. The outer rim is easily broken with wire cutters, the handle is unscrewed (it is attached to a bolt), and the metal of the valve is drilled out with an 8 mm drill. You get two identical glass blanks. Wash and dry them well so that the glass is equally clean.
  2. Cover the holes in the glass with masking tape, then carefully cut the tape to the diameter of the holes. Fill the holes with silicone. Once it has completely set, remove the tape. You will get a surface neatly sealed with silicone. Naturally, do the same with the other workpiece.
  3. Apply silicone sealant along the contour of one of the glass parts and connect both parts. Seal the seam with sealant. After it has completely polymerized, repeat the operation. Carefully trim away excess silicone.
  4. Now pierce one of the silicone “plugs” with two needles from medical syringes. One needle serves to remove air, and with the help of the second, fill the space between the two glasses with water with added table salt or bleach.

The giant magnifying glass is ready!

Let's get to know the world around us

Children aged 3 to 6 years are desperate whys. It's not bad if they are early age find out the reasons for various physical phenomena. Of course, what you will do now can be called a magnifying glass with great stretch, but the experiment turns out to be quite beautiful.

You will need:

  • Three liter jar.
  • Thick thread.
  • Transparent colorless polyethylene film.

Operating procedure:

  1. Place an object in the jar. Cover the neck of the jar with film so that it sags a little. This is understandable: the lens should be convex.
  2. Secure the polyethylene with thick thread, tape or twine.
  3. Now pour water onto the surface of the film. Water plays the role of a magnifying lens. The object inside the jar appears larger.

Good day. Starting to get involved in numismatics and having gray hair with a coin and a magnifying glass a large number of time (while discovering that one pupil is larger than the other, it seems to be chronic), I decided to return their natural charm by converting a state-of-the-art telephone into a magnifying glass. This device is called HTC beats audio (of course, China). Being on the verge of disposal (reasons: the battery almost does not hold a charge, and it is difficult to find the same one, and the phone is so-so), he did not resist the rework. Before the photo shoot, the device wanted to undergo a cleaning and disinfection procedure. (in two words, wipe with alcohol). Here he is.

The tools I needed were:
Scissors, a folding knife, tweezers (or a device for manipulating small objects that are impossible, inconvenient, or undesirable or dangerous to handle with unprotected hands) and a dental spatula (very convenient for picking).

From the materials I needed (came to hand):
Self-tapping screws, as you can see for roofing yourself, are usually found on the roof (neighbors’ ones are even better).

Double-sided tape.

Let's start vandalism. What I liked about this phone is that there is minimal rework. All the manipulations carried out with it took less than thirty minutes, and the result exceeded all expectations, so to speak, but you can evaluate this for yourself at the end of the article by looking at a few photographs.
And so I open the battery compartment cover.

I use a knife to pry out the plastic camera lens protection, which is poorly glued and uses poor quality glue. Naturally, observing proper safety precautions so as not to chop your limbs, and I think you shouldn’t damage the polished surface of the optics, so as not to look at a solid cloudy spot later.

Next, I very carefully, using tweezers and a dental spatula, slightly pulled out and began to unscrew the lens with its body from the base of the camera; to my surprise, it was not secured, as is usually the case, with a drop of glue (or maybe it wasn’t glue).

If it had been glued, then I would have had to disassemble the phone, in general, I was very lucky. After closing the lid back and adjusting the focus, it is practically a nearly complete magnifying device.

But considering that it would not be very convenient to look at something, holding it with (sometimes shaking, just a joke) hands, I decided to install the phone on the legs. I also decided that I wouldn’t burden myself too much with these legs, and I didn’t. Using double-sided tape, I glued the washers to the lid, which were easily torn out from the screws. It could have been done differently and with other washers, but as I already wrote, I wanted it quickly, and the screws fell under the (hot) hand.




The height adjustment (for viewing coins) was done by additionally placing double-sided tape; in my case, the optimal amount was three layers of double-sided tape under each washer, but I adjusted the focus setting by twisting it “with the lens itself.” Well, a few photos that were taken with the finished device. Coin fifty kopecks St. Petersburg Mint (photo taken with a 5 megapixel digital camera).

It’s the same, but only through a ready-made (enlarger) filmed on a digital camera.

Ten kopeck coin from the Moscow Mint through a phone with a digital camera.

He simply took a photograph using a directly converted camera.

Ten again.

Sugar crystals on a ten-kopeck coin.

I didn’t do any backlighting, but I think with properly done backlighting the quality of the photos would be much better. On the cover it says that the phone’s camera is five megapixels (I don’t believe it), by the way, you can compare it with a digital camera, it’s also five megapixels.

For the test, I even decided to sacrifice my hair, a hair pulled from my head, lost and mercilessly torn out again.

Hair against the background of a sugar crystal.

Calipers.

Caliper scale.

I noticed that when you photograph everything as if smaller, for example, the scale of a caliper (in the photo below), the same photo on the screen of a magnifying phone looks different, the screen only fits two millimeters across the entire width, in other words, the magnification is much greater.

Although I was not chasing the maximum magnification (then the article would have been called a microscope from a Chinese phone). But I needed a simple, very quickly made device, specifically for examining coins and, through visual comparison, weeding out mediocre ones, and sending dubious ones to a personal computer and examining them with various programs that can work with photographs and can superimpose images on each other.
And a few more photos. Gel pen paste with fine tip.

Loading...Loading...