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Pentax lens difficult to remove from Super Program /Super A camera

Gotten off with difficulty after 'jiggling. From about half engaged when mounting rotation is very stiff.

On one of the rings behind the mount, at about 2 o'clock there is a rectangular vertical tab that at its base is secured to a ring by two tiny rivets. This tab is not perpendicular to its mount, being angled back about fifteen degrees anticlockwise facing the camera, and slightly lifted. There is evidence of rubbing on the top of this tab. I think that a previous owner had a go at dismantling the mount as one of the mounting screws shows rubbing, indicating that it was not seated below the level of the mount face. However that is not now the case.

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This tab now appears to have been the problem. Using needle nosed pliers, I very carefully realigned the tab at 90 degrees to the mount face with the top lying adjacent to the inner edge of the mount, at the same time ensuring that the top of the tab did not protrude beyond the mount face.

Having done this, I mounted and removed the lens several times without impediment. The last half of rotation of the lens when mounting remains quite tight, but I do not know if this is normal or otherwise for a 50mm f1.4 SMC A. The mounting and lens lugs show virtually no sign of wear so probably retain as-new tolerances.

I hope this helps anyone who may have a mount with a misaligned tab. Although I have an electronic copy of the Super Program/Super A parts breakdown, I have been unable to identify the tab or a part number, probably because it is an integral part of its mounting and the document copy is not sharply rendered.

Cheers

Malcolm

Posted on Aug 31, 2008

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