The ALPA Schneider APO-Helvetar 5.6 / 75mm, SB17 lens offers a sensational high resolution of over 60 line pairs/mm, a nearly inexistent distortion of 0.3 % and lateral color abberation of lower than 2 micrometers (= lower than one third of a pixel).
This is a sister lens of the Apo-Digitar 72mm L but optimized for ALPA. The Helvetar 75 features the common 67 mm front filter thread and an enhanced front element protection (stray light and mechanics).
This version of the Schneider /ALPA Apo-Helvetar 5.6/75 mm can be mounted direct to the ALPA 12 FPS camera body.
In order to operate this lens to any other ALPA camera body (TC, STC, MAX, SWA, WA, XY) the intermediate 17 mm adapter (Part #450.010.317) needs to be attached between lens and camera body.