dave lackey
Veteran
Dave,
Further to the previous post, I've done what I should have for you in the first place and had a quick look at one of my lenses (a C T* 150mm f/4 Sonnar incidentally). The aforementioned pin. Rather than depressing it towards the front of the lens, the shutter should release if the pin is pushed slightly sideways towards the guard. Ideally you should be able to wind the shaft clockwise until it aligns with the red dot, at which point the shaft should remain in that cocked position. It should then fire off at whatever speed the shutter ring is set to when the release pin is moved sideways. If it fails to do so the only easy fix I can suggest is to ensure that the pin itself is not stuck because of a bit of grit or foreign matter. If it's apparently free to move (and it will only move maybe 0.5 to 1mm) then, the shutter may have an internal problem related to the cocking ring and its latch up.
Cheers
Brett
Thanks, Brett, The pin moves sideways to the guard easily. The aperture is wide open but the leaf shutter in the lens is completely closed. I have been trying to move the pin a bit and hold it while turning with a coin. Nothing so far.