U3CCD Series C-mount USB3.0 CCD Camera

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The basic premise of digital microscopes

 In the study of objects with minimal linear and angular dimensions should be performed conflicting clauses, namely:

achieving the distinction between two separate points (resolution);
To allow comfortable viewing.
           Features of "naked" eye due to the physiological characteristics of man, and the distance of best vision equals 250 mm. The low value of the angle of view determines that the observation of objects of small size (without the use of optical and opto-electronic systems), the image formed on the retina of the eye of the observer, has small size. So the details of the observed object are perceived to lack of clarity. In addition, if the object viewed from a short distance, its details blurred, and his eyes get tired quickly.

To create the retinal image of the observer required magnitude can use the following techniques:

Increase the angle subtended by the object of observation, which should bring the object to the eye. Traditionally, to increase the angle of the observed close objects, use a magnifying glass or a classical microscope.
Actually increase the size of the object under study, viewing it from a distance of best vision. As physically impossible to increase the size of the object, you must create its image on any screen for consideration eye. To create this image in the projection microscope.

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