|Posted: Tue May 15, 2018 2:59 pm Post subject:
after a series of interesting circumstances, I've found a further, early postwar (1948) CZJ Sonnar 180/2,8 T, mounted on a Flektoskop reflex housing for Contax.
The lens has the same ring with the two chrome-finished "buttons" and the round window. On this lens, I've learnt that holding the two mentioned buttons, the ring slides turning, allowing the choosen aperture value to be seen through the window.
This means that on my 42x1 Sonnar (a 1955-made piece), the ring cannot be rotated because of hardened lubricant. Luckily, the "22" value appears, so the diaphragm can be closed to all values. Besides that, it's an excellent lens.
Thank you again for your advise,