$14 /day
Schneider 138mm Diopter Lenses shorten the close-focusing distance of normal fixed focal length or zoom lenses. This allows the camera to focus closer to the subject and achieve a larger image size while bringing out the sharpest details in even the tiniest subjects.
Generally, diopters are lens attachments that shorten the close focus distance of lenses by reducing the focal length of the optical system.
Their strength is given as reciprocal of focal length in meter (so called diopter), e.g.:
+ 1 diopter = 1 meter infinity focus plane
+ 2 diopter = 0.5 meter infinity focus plane
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