Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
07-12-2008, 06:14 PM   #1
Senior Member

Join Date: May 2008
Location: Bristol UK
Photos: Gallery
Posts: 140
chinon lens hell

Hi all,

I got a nice condition chinon 200mm f3.5 on ebay but...It wont focus to infinity, the focus barrel stops short and focusses to about 25m or so...anyone else had this issue with legacy lenses and can it be fixed?


07-12-2008, 06:18 PM   #2
Veteran Member
Gooshin's Avatar

Join Date: Sep 2007
Location: Toronto, the one in Canada.
Posts: 5,611
while a K mount it is not built for a pentax camera, the distance to the sensor/film is incorrect.

however, since this is a very simple lens (in terms of construction) you can fix this problem rather easily with a set of minature screwdrivers, a clean workspace and lens cleaning tools since you probably will get a few things dirty unless your hands happen to not emit bodily oil.

you need to take the lens apart, and re-align the focusing barrel so that it moves lower than it currently does, then you will be able to focus to infinity.

however gettting it PERFECT is very difficult, so chances are you will end up with a lens that will focus to infinity, but also be able to focus PAST infinity! so you would have to be careful

best results are with a split primsim focusing screen so that you know when to catch yourself.
07-12-2008, 06:25 PM   #3
Senior Member

Join Date: May 2008
Location: Bristol UK
Photos: Gallery
Posts: 140
Original Poster

I was sort of thinking along those lines in a weird way as i mounted it on my p30t to check if the split screen focus would align, it didnt!

but using it as a benchmarking tool is a great idea, thanks!

07-12-2008, 06:56 PM   #4
Site Supporter
Blue's Avatar

Join Date: Jun 2008
Location: Florida Hill Country
Photos: Gallery | Albums
Posts: 17,212
On a separate note, I bought a Chinon CP-7m about 20 years ago and used my Pentax lenses without a problem on it. Its Ironic.

Also, Ricoh lenses can get even more weird due to Ricoh "evolving" the k mount.

07-12-2008, 07:11 PM   #5
Inactive Account

Join Date: Oct 2007
Location: Brisbane, QLD, AUS
Posts: 3,262
It's weird - I can't use Pentax lenses on my KR10M, but I can use Rikenons on my Pentaxes...

  • 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!
chinon, chinon lens, focus, 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
auto chinon 1:1.9 50mm prime lens lely7 Pentax SLR Lens Discussion 6 09-20-2011 06:33 AM
Has anyone tried the new Sigma 8-16mm? Seems a hell of a lens... Unsinkable II Pentax SLR Lens Discussion 15 05-25-2010 08:34 PM
Chinon 28/2.8 macro lens--any good? heatherslightbox Pentax SLR Lens Discussion 1 06-30-2009 07:50 PM
Trying out manual lens #2 Chinon 50mm f1.7 Mark Morb Post Your Photos! 1 05-30-2009 07:12 AM
Chinon PK50mm F1.4-22 lens Fireball Pentax SLR Lens Discussion 1 08-31-2007 10:24 PM

All times are GMT -7. The time now is 07:47 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]