Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
05-21-2011, 02:27 PM   #1
Junior Member

Join Date: Apr 2011
Location: Nashville
Posts: 36
Kimunur 500mm

I got this lens, Kimunor 500mm F8.0, from a friend who isn't using it anymore. I thought I would play with it with my K-x. It's a K-mount adapter but it's not rigidly fixed lens, is there a specific position that I need to align it with.

Also apart from the Zoom and Aperture ring, it also has another adjustment below that that reads C with a double way arrow, not sure what's it for. Can anyone help me with this.

Appreciate your help.

Last edited by iamarunr; 05-21-2011 at 02:28 PM. Reason: Kimunor 500mm f8.0
05-21-2011, 02:50 PM   #2
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,253
A photo would probably help us answer the latter, but didn't you mean focusing ring instead of zoom ring?
05-21-2011, 10:18 PM   #3
Junior Member

Join Date: Apr 2011
Location: Nashville
Posts: 36
Original Poster
Here's the picture that I found on Flickr.
All sizes | My new 500mm $20 lens | Flickr - Photo Sharing!

Right below the ring marked with 32, 22, 1, there's another ring that says (0<-------->C).

05-22-2011, 04:49 AM   #4
New Member

Join Date: May 2011
Posts: 17
That Be My lens

The O-C ring allows you to step down the aperture once focusing is done. Set the aperture to 22 and then rotate the O-C ring to O which means Open. The aperture blades open back to the f/8 position. This allows focusing while not dimming the image as smaller apertures. Once focused move the ting back to C and the blades close back to f/22.

The lens is slow but relatively crisp for a lens that only has 2 elements.

05-22-2011, 08:35 AM   #5
New Member

Join Date: Feb 2010
Location: Indiana
Posts: 16
I am just guessing but I would bet it is a preset mechanism. Like on the oldest Takumars, set the desired aperture on the numbered ring. Then slide the Open - Close switch to focus then stop down.
05-22-2011, 12:37 PM   #6
Site Supporter
Douglas_of_Sweden's Avatar

Join Date: Apr 2008
Location: Stockholm
Photos: Gallery
Posts: 3,353
O = Open
C = Close
Like bratt said.

  • 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!
500mm, k-mount, lens, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sigma 50-500mm Versus Five Star 500mm Nowhere Matt Pentax SLR Lens Discussion 7 02-26-2010 12:56 PM
Sigma 50-500mm vs 150-500mm or Pentax DA 55-300mm with 1.4 TC? mikejustice Pentax SLR Lens Discussion 20 12-18-2009 07:59 PM
Wanted - Acquired: 100-400mm, 100-500mm, 150-500mm or similar K-mount lens GibbyTheMole Sold Items 8 12-03-2009 11:52 AM
Bigma 50-500mm at 500mm, unprocessed shots. Anywhere? cputeq Pentax SLR Lens Discussion 4 06-21-2008 05:54 PM

All times are GMT -7. The time now is 09:40 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]