Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
11-12-2013, 04:55 AM   #1
Senior Member

Join Date: Aug 2013
Photos: Gallery
Posts: 150
Industar 50-2 - Oil on Blades

Hello guys...need your advise.
I recently bought an Industar 50-2 off fleabay, in New Old stock.
Cosmetic is really nice, lens is clean and clear no dust at all.
But when i check turning the aperture, i immediately noticed oil on the aperture blades.
Considering, this is a preset lens, does having oil on blades impact performance?
Do i need to return this or just keep it? Please help, this is my first time having an I-50-2 :3

Please check attached photo

11-12-2013, 05:31 AM   #2
Inactive Account

Join Date: Dec 2008
Location: North Carolina
Photos: Albums
Posts: 1,720
You'll have a hard time finding a Russian preset without oil on the blades, yours is actually relatively clean by comparison. As long as the oil is not on the glass there is really no reason to worry.
11-12-2013, 05:35 AM   #3
Senior Member

Join Date: Aug 2013
Photos: Gallery
Posts: 150
Original Poster
Thank you so much for the confirmation!!!! Godbless! what a relief!
11-12-2013, 08:06 AM   #4
Loyal Site Supporter

Join Date: Jan 2008
Location: Virginia, USA
Photos: Albums
Posts: 237
Since it is a preset lens the oil on the blades will have no effect since the aperture blades don't have to snap open and closed for exposure (some have said the extra lubrication even helps in this instance, although I'm not sure about that). I would say that about half of my preset lenses have some oil on the blades with the Russian lenses being the biggest culprits. As Elliot pointed out yours is almost dry in comparison to a lot of them.

11-12-2013, 08:42 AM   #5
Senior Member

Join Date: Aug 2013
Photos: Gallery
Posts: 150
Original Poster
im pretty worried about your statements regarding russian lenses having oily blades... i recently bought Helios 44-2, jupiter-9, Zenitar-M 50/1.7, all in new old stock condition as described by the pretty worried they may have oily blades as well
11-12-2013, 08:56 AM   #6

Join Date: Oct 2011
Location: Savannah, GA
Posts: 5,002
Yes, those Russian presets seem to always have oil on the blades, although I have a nice Volna-9 that does not, but that doesn't have a gazillion blades like some of the others either. Is it possible that they are "supposed to" keep good lubrication as the seller's of these lenses often claim?

I am a little disturbed when people always say it has "no effect". While it is true it does not prevent you from using the aperture correctly because sluggishness from oil is not an issue with a preset (whereas an auto-aperture needs to be "snappy" -- instantly responsive opening and closing), oil on blades is shiny and reflective and does increase internal reflections, it causes starburst effects on lights in night shots, etc. So while the aperture works, yes, it does have some effect on image quality.
11-12-2013, 09:18 AM   #7
Senior Member

Join Date: Aug 2013
Photos: Gallery
Posts: 150
Original Poster
Wow i learned somethng from these... thank you guys!!!!

  • 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, check, industar, k-mount, lens, oil, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Oil on aperture blades dgaies Pentax SLR Lens Discussion 2 08-10-2010 07:41 AM
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
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 04:48 PM. | 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]