Just recently purchased a 501C kit with an 80mm C lens (new version) in excellent condition from ebay. The seller had stated the lens had a CLA in Nov. 09. In trying out different functions to make sure everything works OK, I switched the DOF preview switch to stop down the aperature. Presumably by depressing the lower part of the switch it should release and return to the aperature open position. It doesn't release when doing this, but by a gentle lift of the top side it does. Evidently a pivot point doesn't allow enough travel to release it in the normal way. Experimenting, I placed a pin under the switch to raise it a bit and this did allow it to release correctly.
I did a search on this and found a few problems which I think were similiar, but didn't really state if the preview switch was out of adjustment, could be repaired, or if the problem was a precursor to bigger issues. Is this somewhat of a common problem. I don't use DOF preview a whole lot, but it would be nice to have it working correctly.
I did a search on this and found a few problems which I think were similiar, but didn't really state if the preview switch was out of adjustment, could be repaired, or if the problem was a precursor to bigger issues. Is this somewhat of a common problem. I don't use DOF preview a whole lot, but it would be nice to have it working correctly.
