Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-06-2010, 03:39 PM   #1
Pentaxian
fs999's Avatar

Join Date: Jul 2008
Location: Luxembourg
Photos: Gallery
Posts: 3,594
K-7 and bellows : aperture problem

There seems to be a problem with K-7 and my Novoflex bellows. In manual mode the aperture is not closing when taking the photo and neither with the optical preview...

I tried with my K 50mm f:1.2, the aperture is closing fine but not when mounted on the bellows.

Is it possible that the K-7 needs one or more lens information contacts ?
Because the mount on the bellows is painted in black...

I had no problems with my K20D even with DA lenses which are closing at maximum...

01-06-2010, 04:02 PM   #2
Pentaxian
Fogel70's Avatar

Join Date: Sep 2009
Location: Stockholm, Sweden
Photos: Albums
Posts: 1,738
Are you sure the bellows has the mechanical linkage for stopping down the lens from the camera? I think most bellows has a manual control to stop down the lens on the bellows itself.
01-06-2010, 05:13 PM   #3
New Member




Join Date: Nov 2009
Posts: 4
A story before getting to the subject: I dropped my case from a half a meter fall. It is a tamrac case with my K-7 (with a tamron 18-250 attached + grip), an 80-320mm, a Metz flash and some filters.

It was enough to slightly "bend" the lens mount (not visible with a naked eye). Body mount was fine. IŽve got 4 days into complete madness before figuring out what happened. Symptom: camera would take low light pics ok, but daylight (sunlight) pics *always* overexposed.

When I carefully examined the tamron 18-250, IŽve found that the mechanical aperture level was stuck: it is supposed to return to the closed position.

Simply took the lens apart. After removing the screws from the lens mount, I saw that the bend was keeping the inner aperture ring from running (friction).

Now, to the point: remove the lens and check the mechanical aperture leveler. If you carefully move it, youŽll see that the aperture blades will open. Release it and it should return to the closed position. If it is not returning by itself, then I think that might be the problem.

Good luck!
01-07-2010, 02:41 AM   #4
Veteran Member
blende8's Avatar

Join Date: Feb 2007
Location: Bremen, Germany
Photos: Albums
Posts: 1,484
QuoteOriginally posted by fs999 Quote
Is it possible that the K-7 needs one or more lens information contacts ?
Because the mount on the bellows is painted in black...
Yes, that is possible.
Try shortening the contacts with some aluminium foil.
If that works, you can remove the color on your bellows.

01-07-2010, 02:03 PM   #5
Pentaxian
fs999's Avatar

Join Date: Jul 2008
Location: Luxembourg
Photos: Gallery
Posts: 3,594
Original Poster
It works with the aluminium foil... and only in manual mode !

Thank you very much blende8 !
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, camera, dslr, k-7, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Aperture 3 new problem w/SL update rickconklin Digital Processing, Software, and Printing 2 06-19-2010 10:31 AM
mz-s aperture reading problem? kxlxmx Pentax Film SLR Discussion 3 06-07-2010 12:05 AM
aperture problem with 50 1.7 kent Pentax SLR Lens Discussion 9 11-01-2009 05:11 AM
FA 24-90 aperture problem penpig Pentax SLR Lens Discussion 1 01-26-2009 10:08 AM
Bigma Aperture Problem GPeterson Pentax SLR Lens Discussion 4 07-02-2008 08:26 AM



All times are GMT -7. The time now is 03:45 AM. | 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