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Oil on aperture blades...
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PostPosted: Sat Sep 29, 2012 4:36 am    Post subject: Oil on aperture blades... Reply with quote
I've bought a few "new old stock" C-mount lenses on ebay recently, and a couple of the Cosmicar (Pentax) lenses came with some oil on the aperture blades. Is this a common problem? How concerned should I be? (I assume this is the helical grease flowing where/how it should not...) Is this something I could clean up myself?


PostPosted: Thu Nov 08, 2012 6:57 pm    Post subject: Re: Oil on aperture blades... Reply with quote
nater wrote:
I've bought a few "new old stock" C-mount lenses on ebay recently, and a couple of the Cosmicar (Pentax) lenses came with some oil on the aperture blades. Is this a common problem? How concerned should I be? (I assume this is the helical grease flowing where/how it should not...) Is this something I could clean up myself?

It will not affect any lens with present aperture. The problem will become critical in the auto aperture lenses (ie: M42 auto lenses)


PostPosted: Thu Nov 08, 2012 7:06 pm    Post subject: Re: Oil on aperture blades... Reply with quote
lEo. wrote:
nater wrote:
I've bought a few "new old stock" C-mount lenses on ebay recently, and a couple of the Cosmicar (Pentax) lenses came with some oil on the aperture blades. Is this a common problem? How concerned should I be? (I assume this is the helical grease flowing where/how it should not...) Is this something I could clean up myself?

It will not affect any lens with present aperture. The problem will become critical in the auto aperture lenses (ie: M42 auto lenses)


+1 it cause only problem if oil is much and go to inner elements, other ways fine and normal.
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