For example, if you have a Sigma 24-70mm f/4 lens with EF on it, you know that it’s compatible with Canon DSLR cameras. If you see Z, you know it’s compatible with Nikon mirrorless cameras.

Macro lenses can take photos of small things or photograph very fine details. A 1:1 magnification ratio means the reproduction on the sensor is the same size or larger than the real life object.

A book magnifier comes in different shapes and styles. Determine first where you like to read. Perhaps it's your favorite reading chair, in your bed or at your desk. Where you like to read will make a difference as to what reading aids will be most helpful to you.

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For instance, “FE” for Sony identifies the mount system it’s compatible with. In this case, FE tells us the lens is compatible with Sony’s full frame mirrorless cameras.

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F stands for f-stop or f-number and relates to the “speed” of your lens. We use the f-stop scale to denote the lens’s aperture. The size of the aperture is denoted by an “f” followed by a / then a number. It looks like this, f/4.5.

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What is the best Magnifier forreadingbooks

). This is because some zoom lenses have a variable max aperture.

A lens with a 20mm focal length gives you a wide angle. A 50mm lens is considered standard angle, which is similar to the human eye. A 100mm focal length gives you a tighter, more magnified view.

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First and foremost, you should decide what purpose your magnifying glass is going to serve. It’s far better to let the project determine the magnifier required, than to try and turn a single magnifying glass into a one-size-fits-all tool:

The letter “F” does not always refer to the aperture when marked on a lens. You will often see the letter F on Canon, Nikon, Fujifilm, and Sony lenses, but this is to tell you which mount system the lens belongs to.

Each lens manufacturer has a unique way of labeling lens features. But you can expect to see the maximum aperture (f-stop) and focal length labeled on the lens. You may also see other lens features, including the lens mount.

There are tons of cheap inferior magnifying glasses out there claiming 20X, 30X, and even 45X magnifications, yet they sell for less than $10. These are false claims as any magnifier over 20X magnification will have such a small field of vision that they are no longer considered magnifiers, but rather loupes . Higher quality lenses with high magnifications are also more difficult to produce, consequently they tend to be more expensive.

You’ll be able to find the maximum aperture, but your lens may or may not have the “F” on it. You may see a number, a slash, and another number, like this # / #.

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2X and 3X Lenses are the most popular choices for an average user as it offers higher magnification without sacrificing the field of vision (diameter of the lens). On the other hand, a 10X magnifier will reduce the field of vision significantly, but it will give you a closer look at tiny rocks, crystals, minerals, microfossils, etc.

These details also tell you what the lens is capable of and what types of photography it’s good for. That’s why it’s so important to understand what the numbers and letters on a lens mean.

Faster lenses with wider apertures let in more light and give you better depth of field control, but they tend to be more expensive.

By simply getting a brighter light or changing the type of light you use can make a big difference. Magnifier lamp with LED lights is the best choice for you.Use brighter LED and adjustable gooseneck arm so that the light is directed onto your reading material. Use one that has not only an adjustable height but has a easy clip onto headboard,bedstead,desk..

Every lens has a focus ring for manual focusing. Zoom lenses also have the zoom ring for zooming in and out. Newer lenses often have a third control ring, a custom ring you can assign other settings to.

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Do you need to enlarge the print of your book, map, newspaper, or crossword puzzle?- Consider a handheld reading magnifier .Do you want to look fashionable when taking your magnifier to the restaurant or grocery store for deciphering menus and labels?- A pendant or keychain magnifier might work best for you.Do you need to magnify a hobby that requires the use of your hands or other tools, such as knitting or model-building?- One of the many hands-free options is probably your best choice.Does your project involve studying the fine details of a gem, stamp, or document?- A jeweler's loupe is ideal for this type of work.

STM stands for Stepping Motor, and this AF system uses rotating gears to move the elements and focus ring. This is a more basic system found on Canon’s more affordable lenses.

You will also find an abbreviation that tells us what type of motor the lens has for driving the autofocus. Some brands have the same type of motor of all their lenses, but other use different ones on different lenses.

The first number is the f-stop. Some manufacturers express the f-stop as a ratio (1:

USM stands for Ultra-Sonic Motor. Using ultrasonic vibrations to move the elements and focus ring, the USM system is quicker and quieter than the STM driver. Canon use the USM system on their higher end lens models.

This is important if you need a new lens cap. You also need to know the diameter if you want to use lens filters. Screw-on filters come in different sizes, so you need to match the filter size to the lens diameter.

Buying a brand name magnifier, while not always a guarantee of quality, means you can contact the manufacturer if anything goes wrong. E-Tay Industrial Co.,Ltd. specializes in magnifier manufacture more than 30 years with more than 5000 square meters of factory building area . Our core is OEM processing and ODM business, and is a magnifying glass product enterprise with the ability to develop, produce and sell. We are a professional factory for producing magnifier,

Choose the suitable magnifier according your needs.Or tell us your needs, we will recommend the most suitable magnifying glass. 2 kinds of magnifier for example. Handband magnifier lets your hands free to work and ideal for Art/Craft professionals, hobbyist, jeweler, modellers, etc. bar magnifier will have magnification effect when touching a page and enables you to read the targeted rows of texts accurately without misreading the lines. People who deal with figures will find it indispensable. As it lies flat on the paper, it is used hands free.

The key to the confocal approach is the use of spatial filtering to eliminate out-of-focus light or flare in specimens that are thicker than the plane of focus.

For both EF and RF lenses, Canon has it’s L series. The L means it’s one of Canon’s top-quality lenses. For example, you have the Canon RF 70-200mm f/2.8L IS USM lens.

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It may sound strange, but the magnifier with the highest power isn't always the best choice. The human eye has an optimal viewing distance: the closer we hold an object to our eyes, the more of its detail we can theoretically see, but it will be out of focus. That's where the magnifying glass comes in. A magnifier with a 2X power, for example, enlarges an object and lets us see it as though it were two times closer to our eyes, but the object remains in focus. Does that mean that a magnifier offering 20X power is ten times more useful than our 2X magnifier? Not necessarily. There are limits to the practicality of a high-powered magnifying glass, because of the way that magnification, focal length and field of view work together.

When buying a new lens, look carefully at the numbers and letters on lenses. Each holds valuable information. One letter (or lack of a letter) may change the lens’s value by hundreds of dollars!

This article covers what the numbers and letters on your camera lens mean. It may seem not very easy. You can learn to decode the manufacturers’ shorthand with a few hints. So let us look at the most common letters and numbers on camera lenses.

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The focal length of your lens is shown in millimeters (mm) on the lens. Your camera lens may or may not have “mm” on it. You see a number, a slash, and another number (# / #). The first number is the max aperture, but the second tells you the focal length of the lens.

You will always see the maximum aperture, that is the widest aperture, marked on the lens. This will tell you if the lens is “fast” or “slow”, as fast lenses have wider max apertures.

Prime lenses have a fixed focal length, meaning there’s no zoom function. A 50mm prime lens with have 50 or 50mm noted on the lens.

When one thinks of a magnifying glass, they tend to think of the big classic type lens. However, in actual use, you want a lightweight, and powerful magnifier that has impeccable optics and is simple to use. Utilizing the best magnifier for demanding jobs like inspecting diamonds and gemstones is essential to their occupation, while hobbyists who collect rocks and minerals just need to buy a decent magnifier that they can afford to lose. Let we know "What is a good magnifier" before we choose the good magnifier:

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Nikon doesn’t mark the AF motor on their lenses. However, their F-mount lenses do have “-S” after AF (AF-S) to tell users the lens has an autofocus motor. Their older lenses just say AF, and you had to focus them manually.

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You tend to find image stabilization on telephoto or high-end lenses, so if you can’t see one of these on your lens, it doesn’t have built-in stabilization.

On a zoom lens, the focusing distance may be a range of numbers. A reading of 0.5m / 1.64ft – 0.8m / 2.63ft means that as the lens zooms, the minimum focusing distance increases.

The field of view refers to the size of the area that's in focus when viewed through a magnifier’s lens. In much the same way that focal length is inversely related to magnification, so too is the field of view. The higher the power of a magnifying glass, the smaller its field of view will be. That means you'll be able to see more detail with a higher magnification, but only across a relatively small area. Generally speaking, a 2-3X magnifier offering a larger field of view is better for scanning activities like reading, while the smaller field associated with a higher magnification would be more appropriate for the inspection of fine detail.

). A lens reading 1.8 / 55 or 1:1.8 means the lens’s maximum aperture is f/1.8.

Always check the lens for scratches. Place the magnifying glass on a piece of white paper and see if the lens adds any color of its own. Then pick it up and examine other objects, specifically objects with more colors.

A camera lens that shows 0.9m / 2.96ft has a minimum focus distance of 0.9 meters or 2.96 feet. That means you can focus on anything close than that distance.

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The symbol that looks like a circle with a line through it (Ø) tells us the diameter of the lens. This is the measurement, in millimeters, around the outside circle of your lens.

Rather confusingly, a smaller f-stop number signifies a wider aperture and a larger number signifies a narrower aperture. For example, f/22 is narrow and f/2 is wide.

At the widest focal length, the focusing distance is 0.5 meters. But when zoomed in, the focusing distance is 0.8 meters.

Do you need to enlarge the print of your book, map, newspaper, or crossword puzzle?- Consider a handheld reading magnifier .Do you want to look fashionable when taking your magnifier to the restaurant or grocery store for deciphering menus and labels?- A pendant or keychain magnifier might work best for you.Do you need to magnify a hobby that requires the use of your hands or other tools, such as knitting or model-building?- One of the many hands-free options is probably your best choice.Does your project involve studying the fine details of a gem, stamp, or document?- A jeweler's loupe is ideal for this type of work.

＊ lens quality (distortion, color clarity, scratch-resistance) ＊ weight, comfort, and ease of use ＊ durability of frame or handle ＊ incorporation of a light source

A variable max aperture is when the maximum aperture is different depending on the focal length you’re using. For example, a 70-300mm f/4.5-6.3 lens has a maximum aperture of f/4.5 at 70mm. But when you zoom in to 300mm, the aperture is limited to f/6.3.

E-Tay How To Choose A Good Magnifying Glass? Introduction. When one thinks of a magnifying glass, they tend to think of the big classic type lens. However, in actual use, you want a lightweight, and powerful magnifier that has impeccable optics and is simple to use. Utilizing the best magnifier for demanding jobs like inspecting diamonds and gemstones is essential to their occupation, while hobbyists who collect rocks and minerals just need to buy a decent magnifier that they can afford to lose.Let we know "What is a good magnifier" before we choose the good magnifier: E-Tay magnifier factory is a professional manufacturer to offer superior quality magnifying glass products,and provide perfact service for our clients.. E-Tay is one of the largest and most respected manufacturers of optical magnifiers for a wide variety of applications and magnifying glass, fresnel CPV solar magnifier lens Since 1980.

Your lens may have a number in meters and feet (#m / #ft). This is the minimum focusing distance for the lens. This number matters mainly for photographers who like to get close to their subjects.

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All lens manufacturers note the mount system on the lens. This is usually with one to three-letter labels. As we’ve seen, Sony uses FE for it’s full frame lenses.

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Let’s go over the main numbers and letters on lenses to give you  better understanding of your gear. We cover everything from f-stop numbers to magnification ratio. If you want more information, you can see our guide to cameras lenses in this link.

Although the perfect lightweight magnifier, combining a clear, high magnification with a wide viewing area is an optical impossibility, finding the perfect magnifying glass for your personal needs is not only possible, it's a definite reality.

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Lenses with built-in image stabilization have it noted in the lens’s name and somewhere on the physical lens. All lens brands do this, but they don’t all use the same acronym.

We recommand lighted 3X handheld magnifier for daily reading. 3X illuminated handheld magnifying glass provides evenly & sufficient lighting without glare and light viewing area for reading in dim condition.

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Telephoto lenses often have a range of numbers on either side of the slash (

Sigma makes lenses compatible with Canon, Nikon, and other camera brands. By finding the lens mount label, you will know which cameras the lens is compatible with. The same goes for Tamron and Tonika.

If a zoom lens only displays one f-stop number, like f/2.8, the maximum aperture is constant throughout the zoom range. You don’t lose any aperture stops when you zoom in.

This deeper depth of field also requires a higher aperture (f16), which creates a smaller space for the light to be let in — because of this, you'll need a ...

You’ll find a switch on the side of the lens to activate the IS. It most cases it will say “IS On / Off”. If it has more than one mode it will say ” IS Off / 1 / 2″.

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A number of components contribute to the performance of your magnifying glass, but for the average user, there are three main features you should consider:

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If the ratio is 2:1, then the reproduction on the sensor is twice the size of the original. If the ratio is 1:2, the sensor image is half the size of the real thing. You may have the option to change the ratio on your lens.

Zoom lenses have a variable focal length with the limits of the range in the title of the lens. The focal range will also be marked on the lens. It would look like 70-200, which tells us the lens has a minimum focal length of 70 and a max of 200. The zoom function allows you to move between the two limits.

Page LED Page Magnifier has ideal magnification for reading small prints, viewing , and checking tiny hobby and crafting material. Size:29.5x6.5 inch covers large area of a page.This led page magnifier is equipped with 12 energy efficient led lights, they are designed to last for more than 25,000 hours without burning out or overheating. They are bright enough for reading in dim condition, the neck yard to hang the magnifier around neck providing hands-free experience.

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The numbers are equal but expressed in two different measurement systems as different countries use either metric or imperial measurements.

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The focal length of a magnifier is the distance from its lens to the object being viewed, when the object is in focus. The power and focal length of a magnifying glass are actually inversely related. In other words, the higher the magnification, the shorter a magnifier’s working distance is, and vice versa. Having sufficient room to manoeuver beneath the lens is an important consideration when your hobby or project requires the use of tools, and it’s one of the reasons why a higher magnification isn’t always the better choice.

Manufacturers stamp lenses with details about the glass, aperture range, focal length, and other specifics. It’s all important information, so it’s a good idea to take the time to learn what all these number and letters stand for.

We’ve already seen that some lenses have a switch for the image stabilization. But others might have a custom function button. This is labelled L-Fn, and you can assign different settings to it.

What do the numbers and letters on lenses mean? You may have wondered when thinking about buying a new lens or looking at one you already own.

First and foremost, you should decide what purpose your magnifying glass is going to serve. It’s far better to let the project determine the magnifier required, than to try and turn a single magnifying glass into a one-size-fits-all tool:

Some telephoto and macro lenses have a focus limiter switch. The label will say something like “Full / ∞ – 3m”, though the noted distance will vary depending on the lens.