How to fix a sticky aperture?

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Posted by Scott on February 21, 2000 at 12:29:34:

I have a 28mm Pentax lens with a problem. The iris seems to be 'sticky'... when you stop down the aperture ring the actual iris itself (the blades) closes down VERY slowly - as if there was oil on the blades making them stick. In other words, if I have the lens at f2.8 and then quickly close it down to f22 it takes about one and a half seconds for the iris to actually stop down.

Can anyone recommend a remedy? If I have to I'll try disassembly... any suggestions would be greatly appreciated!

Thanks,

Scott

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