Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
06-02-2010, 03:58 AM   #1
New Member
ustinof's Avatar

Join Date: Nov 2009
Location: Tambov
Photos: Gallery | Albums
Posts: 6
Zeis Sonnar 180mm/2.8 Pentacon six

Купил такой. Диафрагма не работает. Как починить?

06-02-2010, 04:44 AM   #2
Veteran Member
kevinschoenmakers's Avatar

Join Date: Mar 2009
Location: Shanghai
Photos: Gallery
Posts: 1,509
Perhaps this will solve your problem: Shooting manual lenses on Pentax DSLRs «
06-02-2010, 05:53 AM   #3
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 16,316
by the aperture not working, do you mean that when mounted to the camera using an M42 to K mount adaptor, the aperture is always at minimum?

If this is the case, you need to modify the lens to force the aperture open to the setting.

This is usually achieved by removing the lens mount, and placing a small spacer over the apterture activation pin, forcing it to always push the mechanism back.

I used the clean end of a ball point pen revil, cut about 3mm long to slide over the pin on one lens.

This modification needs to be done on any lens that is auto aperture (i.e. an aperture pin) that is lacking the auto manual switch.

There is a thread somewhere in the forum stating that a company in the UK is now making M42 to K mount adaptors with a shoulder incorporated that will automatically engage the pin when the lens is mounted.

DO a search to see if you can find it, it was within the last 2 weeks.

  • 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!
k-mount, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
CZJ Sonnar 135/3.5 or Jupiter-9 85/2? Free Soul Pentax SLR Lens Discussion 13 03-21-2009 08:43 PM
Sonnar Bokeh wildherre Post Your Photos! 7 02-28-2007 09:39 AM

All times are GMT -7. The time now is 12:34 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]