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Doug C. wrote:
Yes on two different cameras. It looks like the aperture may be stopped down and locked up as changing the aperture does nothing. Is there a way to release it?
So, when the lens is off camera, hold it up to a light and look through; if it's still dark, then the diaphragm is stuck closed, or nearly closed. If this is the case, put it on a camera, set the aperture using the camera mail control dial (in Av)to f/8 or so, and then 'exercise' the lens by pressing and releasing the DOF preview button.
OTOH, a remote possibility is that there is something shorting out (i.e. connecting) one or more of the lens-to-camera contacts at the base of the lens. Who knows? Maybe a short between pins 2 & 3 makes the aperture go to max stop-down position. Anyway, it's probably worth a look.