Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-01-2011, 12:53 PM   #1
Senior Member




Join Date: Nov 2010
Posts: 138
Chinon 135mm f2.8 M42

Hi,

I have the mentioned lens in a M42 screw mount. The problem I'm having is that after I screw the lens on, I can't seem to set the aperture to the one desired. It basically stays wide open no matter how much I turn the ring. The switch on the lens is turned to Manual (M showing on the lens).

When I try to turn the aperture ring when the lens is dismounted it closes fine. Anyone knows what could be causing this?

Btw, my Takumar 200mm doesn't have this kind of problems.

02-01-2011, 03:17 PM   #2
Site Supporter
ramseybuckeye's Avatar

Join Date: Apr 2009
Location: Elida, Ohio
Photos: Gallery | Albums
Posts: 8,622
I don't have a Chinon, but I'm sure you've tried setting it to auto, in case the lens marking is opposite of most. There is no pin getting depressed when screwed in is there? Something is changing when the lens is mounted, look closely when mounting it, compare the mount to your Tak.
02-01-2011, 06:39 PM   #3
Veteran Member




Join Date: Oct 2010
Location: Baltimore
Posts: 2,542
QuoteOriginally posted by BeerBelly Quote
Hi,

I have the mentioned lens in a M42 screw mount. The problem I'm having is that after I screw the lens on, I can't seem to set the aperture to the one desired. It basically stays wide open no matter how much I turn the ring. The switch on the lens is turned to Manual (M showing on the lens).

When I try to turn the aperture ring when the lens is dismounted it closes fine. Anyone knows what could be causing this?

Btw, my Takumar 200mm doesn't have this kind of problems.
Also, put a base cap on lens and try out aperture, if it works then it might be something on your camera mount. If it doesn't work, look at base of lens carefully, even with a magnifying glass and see if there is anything unusual
02-01-2011, 11:44 PM   #4
Senior Member




Join Date: Nov 2010
Posts: 138
Original Poster
Thank you guys. I'll try it out today and let you know the results.

02-03-2011, 11:54 PM   #5
Senior Member




Join Date: Nov 2010
Posts: 138
Original Poster
I seem to have solved the problem somehow or it solved itself :S
Anyway, if I hold the lens upside down (with the front end facing me) the aperture closes and opens just fine, even when mounted. So I'm thinking it must be something in the aperture ring that's a bit loose.
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, lens, m42, pentax help, photography, screw
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Chinon 200, 135, 35 (M42) - Experience? KjetilH Pentax SLR Lens Discussion 1 10-01-2009 10:36 AM
Chinon 135mm 2,8f losecontrol Pentax SLR Lens Discussion 1 02-12-2009 04:20 AM
Chinon 135mm 2.8 Question xfire Pentax SLR Lens Discussion 2 05-08-2008 07:10 AM



All times are GMT -7. The time now is 09:30 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