Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-30-2011, 02:11 PM   #1
Junior Member




Join Date: Feb 2009
Location: Greenwich, SE London, UK
Posts: 35
Oily Aperture K135 3.5

A couple of days ago I was searching through my local camera shop bargain bin and found an SMC 135.3.5 in beautiful cosmetic condition but it had oily blades and the aperture was very slow. I bought it for 5.

My original intention was to cut off the protruding part of the aperture arm, so that open aperture metering would no longer work, and thought by doing this it would turn into a screwmount type lens with full av metering, just like a Takumar.

Then I thought this lens is too nice to damage in such a way, so beer in hand I plucked up the courage to take it apart and clean the blades with lighter fluid. I didn't know how easy this would be but under half an hour later I now have a fully functioning SMC 135.3.5, for a fiver.

My question is, if I did cut the aperture arm off, would it have worked at all apertures in AV mode, like a Takumar?

Thank you

Phil P

07-30-2011, 02:50 PM   #2
Veteran Member




Join Date: Dec 2009
Location: Ontario
Posts: 550
The problem is that with the oil on the blades eventually the blades will stick all together and the aperture blades will not move all together.
07-30-2011, 11:13 PM   #3
Veteran Member




Join Date: Jan 2010
Location: Vancouver, BC
Posts: 1,421
QuoteOriginally posted by f8orbust Quote
A couple of days ago I was searching through my local camera shop bargain bin and found an SMC 135.3.5 in beautiful cosmetic condition but it had oily blades and the aperture was very slow. I bought it for 5.

My original intention was to cut off the protruding part of the aperture arm, so that open aperture metering would no longer work, and thought by doing this it would turn into a screwmount type lens with full av metering, just like a Takumar.

Then I thought this lens is too nice to damage in such a way, so beer in hand I plucked up the courage to take it apart and clean the blades with lighter fluid. I didn't know how easy this would be but under half an hour later I now have a fully functioning SMC 135.3.5, for a fiver.

My question is, if I did cut the aperture arm off, would it have worked at all apertures in AV mode, like a Takumar?

Thank you

Phil P
That's a nice find and even better, an easy fix to get fully functioning K135/3.5. I guess there is no auto/manual switch on the lens - when you had the lens apart was there a way to remove the diaphragm actuator arm and be able to reverse it if you choose to do so later on? If you cut off the arm you will definitely affect the resell value but yes, removing the arm should give you stop down metering (Av mode). Cutting the diaphragm actuator arm and permanently disfiguring a fine lens seem too much of a waste.

Now that the K135/3.5 is working as it should, you should be able to make a tidy profit over your initial investment. Perhaps you should sell the K135/3.5 and replace it with something like CZJ Sonnar 135/3.5 or the Jupiter 37A 135/3.5, both of which are very sharp lenses and shoot in Av mode only.

Thanks,
07-31-2011, 09:47 AM   #4
Pentaxian
Just1MoreDave's Avatar

Join Date: Feb 2007
Location: Aurora, CO
Photos: Gallery | Albums
Posts: 4,862
The aperture lever doesn't come off easy in the lenses that I've seen. It's often an integral part of the same mechanism that moves the blades when you turn the ring, which you want to retain. It's the same kind of problem you run into changing mounts, with the added difficulty of reversability.

07-31-2011, 02:31 PM   #5
Junior Member




Join Date: Feb 2009
Location: Greenwich, SE London, UK
Posts: 35
Original Poster
Thank you everybody. Very helpful. ....and you have given me an idea.

I find quite a few manual focus 'broken' K mount lenses (though rarely Pentax - they don't break do they?) in my local photography shop bargain bucket, ranging from 0 (if you buy something else too) to 5 max. Many of these have stuck apertures, bent actuator arms etc etc.

ps. I tried the ex oily K135 today. Very nice lens

Thank you again

Phil P
Reply

Bookmarks
  • 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, arm, av, blades, k-mount, lens, pentax lens, slr lens, smc, takumar
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Success - Oily Blades, Clean and Snappy MountainManJim Welcomes and Introductions 6 04-10-2011 09:01 PM
M42 Vivitar 28/2 - sticky/oily? aperture help RolloR Pentax SLR Lens Discussion 2 06-09-2010 09:14 AM
How to fix oily aperture blades madhurvyas Photographic Technique 5 03-30-2008 02:21 PM
How to fix Oily aperture blades madhurvyas Photographic Technique 0 03-12-2008 01:03 AM



All times are GMT -7. The time now is 11:17 PM. | See also: NikonForums.com, CanonForums.com 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?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top