The Schneider 90mm f/4.5 APO-Componon HM is one of the apochromatically corrected enlarging lens of the Schneider HM Series. It is a 6-element, 4-group lens that is corrected for flat field, high contrast transfer, and excellent definition over the whole field. The 90mm lens is most commonly used to make photographic prints with medium format negatives up to 6x7cm in size.
Mechanically, the Schneider Componon's also match the latest state of the art with illuminated aperture scales, click stops as well as stop-less aperture adjustments and with preset aperture controls. Disengaging the click stop system permits precise fine adjustment of the aperture when working with color analyzers and other meter systems. Once the lens is stopped down to the desired aperture, the preset control allows it to be reopened fully for cropping and/or refocusing, and then stopped down again to the working aperture shown on the luminous scale.
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