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Thus, while a "full page magnifier" based on a fresnel lens can span some 625 cm 2 (96.9 sq in) , it typically achieves no more than 1.4x magnification (advertised as "2x" if measured by area instead of the scale factor); an aspheric segment hand magnifier can achieve a scale factor in excess of two (area factor in excess of four) but typically ...
Conquer even the smallest type with this handy gadget — complete with a light that allows you to read in bed without irking your spouse.
A typical magnification for use in dentistry is 2.5×, but dental loupes can be anywhere in the range from 2× to 8×. [15] Optimal magnification is a function of the type of work the doctor does - namely, how much detail he or she needs to see, taking into consideration that when magnification increases, the field of view decreases.
As the user moves the pointer or cursor the screen magnifier should track with it and show the new enlarged portion. If this tracking is jerky or flickers it is likely to disturb the user. Also, the pointer or cursor may not be the content of interest: for example, if the user presses a keyboard shortcuts that opens a menu, the magnified ...
A dome magnifier is a dome-shaped magnifying device made of glass or acrylic plastic, used to enlarge words on a page or computer screen. They are plano-convex lenses: the flat (planar) surface is placed on the object to be magnified, and the convex (dome) surface provides the enlargement. They usually provide between 1.8× and 6× ...
A sheet magnifier consists of many very narrow concentric ring-shaped lenses, such that the combination acts as a single lens but is much thinner. This arrangement is known as a Fresnel lens . The magnifying glass is an icon of detective fiction , particularly that of Sherlock Holmes .
Unlike most similar programs, it does not open a separate program window for the magnification but instead puts a movable magnifying glass [1] on the screen. Virtual Magnifying Glass works on a variety of platforms (Windows, Linux, FreeBSD, Mac OS) due to being developed with the Free Pascal compiler. There is no charge for the software.
The name "camera lucida" (Latin for 'light chamber') is intended to recall the much older drawing aid, the camera obscura (Latin for 'dark chamber'). There is no optical similarity between the devices. The camera lucida is a lightweight, portable device that does not require special lighting conditions. No image is projected by the camera lucida.
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