Contrast

Contrast” refers to the degree to which both dim and bright objects in the image presented to the viewer can be differentiated from each other and from the background of the image. High contrast is excellent, since then the viewer can observe fainter objects and subtle visual details better. The same applies to differences in color especially in darker or difficult light conditions. A number of factors affect contrast, like the objective lenses, the quality of the optic coatings, collimation, prisms and quality of the eyepieces.

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