Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
08-10-2010, 04:44 AM   #1
Veteran Member
dgaies's Avatar

Join Date: Oct 2009
Location: Maryland / Washington DC
Posts: 3,917
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
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 49,683
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 Webmaster (Site Usage Guide | Site Help | My Photography) server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

08-10-2010, 07:41 AM   #3
Site Supporter
Site Supporter
gofour3's Avatar

Join Date: Oct 2008
Location: Vancouver, Canada
Posts: 6,904
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.


  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
aperture, blades, copies, issues, k-mount, lens, oil, oil on aperture, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
I'm Heartbroken Oil on the Blades A-50mm Macro F 2.8 Indecent Exposure Pentax SLR Lens Discussion 21 04-12-2010 09:18 AM
Used lens with oil blades w003txz Pentax SLR Lens Discussion 1 02-05-2010 07:02 AM
Oil on apeture blades Scott_the_Artist Troubleshooting and Beginner Help 14 01-31-2010 12:01 AM
oil on the blades oatman911 Pentax SLR Lens Discussion 16 02-19-2009 08:27 PM
For Sale - Sold: A flawed diamond: Pentax SMC-A 50/2.8 Macro..with oil on the blades :-( dumrox Sold Items 5 01-27-2009 03:46 PM

All times are GMT -7. The time now is 10:11 AM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]