Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
03-16-2014, 10:54 AM   #1
Veteran Member
Ikarus's Avatar

Join Date: Apr 2010
Location: California
Photos: Albums
Posts: 471
Suspected aperture lever misalignment on A-lens - easy fix?

I'm finding that my DA 40mm f/2.8 XS applies the exact same aperture at f/2.8 and f/3.2 in manual mode on both K-x and K-01. This leads me to suspect that the lens is already wide open at f/3.2 due to a misalignment of the aperture lever. Is this easy to fix or would you discourage me from attempting this myself?

03-16-2014, 12:17 PM   #2
Site Supporter
Site Supporter

Join Date: Nov 2012
Location: North Wales
Photos: Gallery | Albums
Posts: 1,572
I've had a couple of lenses whose aperture levers have been bent out of alignment. The symptoms were clear cut: the lens was not stopping down effectively with change in f-stop with the aperture ring. Easily fixed by judicious bending back into place.

in your case, I advise careful diagnosis before assuming an aperture lever problem. Check whether the exposure seems to be changing correctly with change of f stop in M mode.
03-16-2014, 12:18 PM   #3
Site Supporter
Site Supporter

Join Date: Aug 2011
Location: New York, NY
Photos: Gallery
Posts: 1,631
I suggest you push the lever in or out slightly--depending on which you you think it needs to go. If not one way then try the other--which is what I did on my 50mm (M) f1.7. It may not take much pressure to fix. FWIW I suggested it to another via this forum and he/she reported it worked.
03-16-2014, 04:15 PM   #4
Just1MoreDave's Avatar

Join Date: Feb 2007
Location: Aurora, CO
Photos: Gallery | Albums
Posts: 4,880
Some levers are part of one larger assembly, stamped and bent. Some are attached by a couple of screws. The second kind are easier to adjust, usually the screw holes are designed to allow that adjustment. I would be reluctant to start bending a lever without some idea of how much to move it and what the rest of the assembly looks like. Maybe wrap some tape around it to make it thicker, see if that helps, then measure the tape thickness with a caliper.


  • 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, f/2.8, f/3.2, k-mount, lever, misalignment, misalignment on a-lens, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
K10D aperture lever coa75 Troubleshooting and Beginner Help 2 04-05-2013 08:09 AM
Removed aperture control lever Mikesul Pentax SLR Lens Discussion 4 03-04-2013 11:37 AM
Who needs a tool to fix missing Lens identifications for iPhoto, Aperture etc? tempelorg Digital Processing, Software, and Printing 19 03-12-2012 04:10 AM
lens aperture lever sticks... Alizarine Pentax SLR Lens Discussion 10 08-07-2011 10:43 AM
Fix stuck aperture blades on Super Tak? jsherman999 Pentax SLR Lens Discussion 2 03-06-2008 10:34 PM

All times are GMT -7. The time now is 01:14 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]