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I Need Magnification I have low vision - Computers & Internet

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You need the magnifier from the Accessibility tools. On Windows XP this can be found in Start Menu -> Accessories -> Accessibility -> Magnifier (if it's not installed, go to Control panel -> Add/remove -> Add Windows Components and install it)

On Windows Vista it's in All Programs -> Accessories -> Ease of Access -> Magnifier.

Posted on May 30, 2008


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How do I select a monocular lens?

Having a monocular is a great alternative other than carrying a pair of binoculars. They are significantly more compact, lightweight and portable but they come with only the half of the size of binoculars. The following article talks about how to Select the best monocular lens between your budget and needs.
Need to consider the points below:
  • Monocular vs. Spotting Scope
    A monocular significantly featured a compact and portable design. Monocular lenses that are bigger generally have more power, larger lenses and wider views are known as spotting scopes. A spotting scope will be notably greater and heavier than a typical monocular which are frequently used for bird watching, hunting, or spotting subjects from a static position. In case require better performance, and you are compatible with the size or weight, then you have the hardly better option than a spotting scope
  • Good Monocular Power
    The power or magnification are the things that you should consider first when choosing a monocular lens. This device typically has a higher magnification of 6x to 10x which will allow you to see further and in more detail. The monocular with 9x or 10x magnification will usually slightly high priced more than 6x or 8x ones. The good thing is, about this device, that you can get the same power of binoculars, but they are only half of the size of their counterpart.
  • Right Lens Size
    If you look at the specifications of a monocular, you will find two numbers. For instance, 8×25; which means 8x, the first number, denotes its power, and 25mm, the second number, represents the size of its lens.

    A monocular comprises with a lens of 20mm to 42mm. With a bigger monocular lens, you can observe see a wider view, and will also result in a better, sharper image while looking through the device. The downside is that the larger the size of the lens is, the heavier and bigger the device will be.
  • Monocular Size and Weight
    On the whole, an 8×25 or 10×25 monocular is considered to be a pocket-size or compact device which will simply be fit in your pocket. They usually come with a small carrying bag. The pocket monocular works as a cool device. They are very portable as it is easy to carry them around everywhere - keeping in the car or in the pocket when climbing. These devices are low-priced and can also serve well.

    You will have to keep it in your mind that an 8×25 or 10×25 pocket monocular is very small, so you cannot expect too much performance from it! These tiny monocular have a small lens but can provide a very limited view though they have good power. At first, you will need to detect your subject and later use the monocular in a "point and shoot" style. It is not at all easy to use them since they have a small eyecup. If you want to enjoy a wider, sharper and brighter image, then you should always opt for a 30mm to 42mm monocular.
  • Night Vision Monocular
    If you are planning on buying a monocular in order to use at night or whole darkness, then you should go for a night vision monocular. IR illuminator is built-in these devices which will increase your night vision capability. Having less magnification, you can use them normally to get a better image and off course less fuzzy. These monocular usually come in different sizes, magnification and price range.
This guide helps you to choose a monocular lens that you are looking for.

Mar 19, 2018 | Optics

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How and where do i remove the battery

Note where he points to place the battery at 3:49 minute mark
Night Owl Optics Night Vision

requires (1) 3-volt Type-123 lithium battery (not Included)

Apr 15, 2016 | Night Owl Optics Night Owl NONEXGEN-W...

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What do the terms 3x40 mean

The first number specifies the magnification. The second number is the size of the front lens. "3x40" means a three-power magnification with a front lens 40mm across.

The lens size is given because a larger lens collects more light and thus produces a brighter image. A 7x50 will be usable longer after sunset than a 7x35, for example, though neither should be considered as night-vision glasses.

Nov 13, 2012 | Leapers Accushot 3X40 Cqb Retical...

2 Answers

How do I increase the field of view on a zeiss OpMi-1?

Field of view and working distance vs magnification is a law of physics. Using the lowest power gives you the widest field of view and greatest working distance but the trade of is that you loose magnification. Conversely as you increase magnification you decrease working distance and you loose field of view diameter.
The optics of your microscope are limited to .4x to 2.5x magnification. Your working distance is limited to 200 - 400mm depending on the magnification you are using.
I am not aware of any interchangeable lenses for this scope.

Nov 28, 2010 | Zeiss Microscope

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What is low vision?

Low vision is a term describing a level of vision below normal (20/70 or worse) that cannot be corrected with conventional glasses. Low vision is not the same as blindness. People with low vision can use their sight. However, low vision may interfere with the performance of daily activities, such as reading or driving.

Nov 23, 2010 | Health & Beauty

2 Answers

How to determine the lowest possible usable magnification for a telescope

Don't confuse low power with WIDE field. Usually to get the lowest power and widest field you need to move to a 2 inch eyepiece, and a 2 inch diagonal.

About 38-42mm eyepiece will be the lowest power. Take a look at the GSO Superview 2 inch eyepieces, which yield a wider view. and low power.

Oct 29, 2010 | Celestron CPC 925 XLT (555 x 235mm)...

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Is my bushnell insta vision 7x35 or 10x50- how do I tell ?

The first number is the magnification the second number is the size in millimeters of the objective (large lens) So if you measure the diameter of the front large lens that will give you the size. So a 10x50 means a magnifyng power of 10 and an objective of 50mm.
Now to find out the magnification if you don't know what it is. Measure the front lens. Then if you look through the eyepiece lens while holding it away from you you will see that there is in each a small circle of light. That it what is known as the exit pupil. It lines up with the pupil of your eyes when you have the binoculars pressed up against your eyes. Now measure the diameter of the exit pupil in millimeters. It will only be a small number.

To work out the magnification use this formula. Magnification = Objective size divided by the exit pupil.
So a 10x50 will look like this M = 50 divided by 5....therefore M =10 which is the magnification.

Both the 7x35 and 10x50 will have an exit pupil of 5mm. So if yours is one of these then all you need is the objective (large) lens size.

Aug 04, 2009 | Bushnell InstaVision Binocular Binocular

1 Answer

Does this telescope need accesories for proper function

Do you have eyepieces? At least two? The bigger the number on the eyepiece the LOWER the magnification-- something around say-- 20mm and 10mm ??

Usually their is a small "finder" scope attached to the top of the main tube to use to help you center and find distant objects. ??

and of course a tripod to hold the telescope.

Look through this web site--

Apr 14, 2009 | Vivitar Optics

2 Answers

Problems with viewing under low magnification (20x) only red stain


For the red colour partical your illumination angle should be 0 degree.
As per you exepirience you are getting red at low magnification and not getting at high magnification. at the higer magnification the light deviation you can apriciate more then lower.

try to adjust your light source focusing lenc at higher magnification so at the lower it will be more better,

for the further problem you can contect me any time,



Oct 11, 2007 | Tasco 750 Monocular Microscope

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