This M lens, however, kinda does work, but not really as expected: Cosinon-T 135/3.5 Metering with the green button works, but only at full aperture. The lens don't ever stop down, not at metering nor exposure.
alex wetmore:
Look to see if there is anything unusual on the mount around where the * contact goes:
Jostein:
Sometimes the aperture lever can be slightly bent so that the camera doesn't
catch it. In my experience, the newer cameras are more prone to this than older
cameras. Compare the distance between the aperture lever and the bayonet flange
with another lens. It's safe to bend it back into position with your fingers.
After examinination I found out that the stop down mechanism inside the lens must be broken. It actually never stops down, even when disconnected from the camera. The stop-down indicator follows the aperture ring, but the aperture blades doesn't move.
This means that my ME:s and Program A will overexpose with this lens set to anything else than full aperture, since they read the stop-down indicator and increase the shutter time accordingly, but the *istD that doesn't read the stop-down indicator will do a correct exposure. Funny.
And funny that I didn't notice earlier. On the rare occasions that I have used this lens I have to had used it at full aperture. Or maybe I have had some ruined shots that I didn't connect to the lens being faulty. I acquired it (plus the Tamron 200/3.5) by acting as courier between two friends in different cities, but when I was to deliver them, it turned out that the reciever had another camera brand and couldn't use them, so I got to keep them. They have mostly been sitting in a drawer since then, as I alreday had a favourite zoom that covered that range.
anders ------------------------- http://anders.hultman.nu/ med dagens bild och allt!
