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08-10-2010, 04:44 AM   #1
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Oil on aperture blades

Upon closer inspection of one of my two copies of the FA50/1.7, I noticed what I assume is some oil on one of the blades (although I've never actually seen oil on an aperture blade before, I'm pretty sure that's what this is).

Anyway, I've used this lens quite a bit and never noticed any issues in terms of operation. I only notice the oil because I was inspecting it more closely for someone who was potentially interested in purchasing on of my two copies.

My question is, based on the picture below, should I except to see any degradation in performance of the lens? Also, assuming there are no functional issues, and I were to eventually sell this copy as well, what would be a fair reduction in price to compensate for the oil?



08-10-2010, 05:50 AM   #2
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Since it doesn't cover the opening and definitely doesn't hurt the blades' opacity, I'd say that there won't be any significant effect on IQ. I would also expect the oil to distribute itself a bit more evenly over time.

Adam
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08-10-2010, 07:41 AM   #3
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I have a K20/4 that was over exposing shots by about 1 to 2 stops. I sent it in to Eric for a CLA and it had oil on the aperture blades, which was causing the aperture to take longer to close. So if you start noticing something along those lines then it’s time to act, otherwise if your shots are properly exposed I would agree with Adam and just leave it.

Phil.
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