I've had a couple where it was the grease used to lubricate the aperture lever itself. Remove the mount from the lens and check, it's an easy fix IF the mount screws are not frozen. Use a screwdriver that fits them _perfectly_ or they'll probably strip.
Don > -----Original Message----- > From: Lucas Rijnders [mailto:[EMAIL PROTECTED] > Sent: Thursday, May 11, 2006 4:38 AM > To: PDML > Subject: Aperture repair on a M lens? > > > Hi all, > > Recently I bought a M 35/2.8 as an aside to another lens purchase. It > arrived yesterday. The lens looks very good, the glass is flawless, the > aperture blades are clean, but open and close very sluggishly. If I push > the diaphragm actuator I feel a lot more resistance than with known good > lenses. > > The lens seems in good enough shape to try to repair the diaphragm. > Searching for tips on how to do this I only found oily blades or a > loosening spring as possible causes for a sluggish diaphragm. Both > explanations don't seem to conform to my observations, so something else > must be the matter... > > Would anyone have a suggestion on what might be wrong with the lens? Any > tips on how to tackle the problem? Would you start from the front or the > back of the lens in this case? > > I'll be gratefull for any insight, > > Thanks in advance, > -- > Regards, Lucas >
