The distance to the optical path of the system increases and creates the It leads to different magnifications when The distortion (or visual distortion) is a geometric image defect In case of telecentric lenses, the telecentric area is essentially the depth of field area. The hyperfocal distance is a special instance in which the depth of field area extends to infinity.
the larger the f-number) the greater the depth of field area. The depth of field (DOF), often erroneously dubbed “field of depth”) describes the expanse of the focussed area (within the object space) in front of and behind the optimal focus level. The contrast describes the relationship between light and dark areas of an image, indicated in per cent (%). MTF (also called contrast transfer function) describes the comparison of the contrast of the edges of a (real) object with the contrast of its image at a certain resolution (MTF = image contrast/object contrast). The dependence of the resolution from the contrast describes the modulation transfer function. Specification is made in line pairs per mm (Lp/mm). The resolution of optical instruments is limited by diffraction.
The resolution of an optical system indicates the discernibility of two minute structures that can still be perceived separately.
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