If you are certain that it's not the oil, then it could be an aging spring.
regards,
Alan Chan
>I'm marking this as On-Topic simply because I'm posting Pentax-related
>material on a Friday. Sorry! <g>
>
>One of my Super-Tak 200/4's arrived today, and the aperture takes forever
>to stop down. The blades aren't oily or greasy, but they move
>veeeeeeeeery slooooooooowly. I've tried working the ring back and forth,
>back and forth, back and forth until my roommate got scared and wanted to
>take me out to meet some women, but it didn't help. Any idea what could
>be causing this? Is it a simple repair? I've never taken a lens apart
>that I could put back together, but I might be willing to risk it on this
>one.
>
>Thanks!
>
>chris
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