Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
08-22-2013, 09:51 PM   #16
Senior Member

Join Date: May 2012
Photos: Gallery
Posts: 124
So reviving an old thread....does anyone know if anyone posted pictures of the RioRico mod mentioned above? I have a few Yashica lenses I want to mod, and i think I get his process, but some good visual evidence would make me feel more comfortable. Thanks.

08-23-2013, 06:33 AM   #17
hoanpham's Avatar

Join Date: Nov 2009
Location: Strand
Photos: Gallery | Albums
Posts: 1,366
Original Poster
i ended buying a canon 5d. it is cheaper than convert my contax lenses.
08-23-2013, 06:38 AM   #18
ducdao's Avatar

Join Date: Dec 2009
Location: Montreal/Vermont
Posts: 2,160
QuoteOriginally posted by hoanpham Quote
i ended buying a canon 5d. it is cheaper than convert my contax lenses.

The 5d classic is a steal for FF these days.
03-01-2014, 01:52 AM   #19
Forum Member

Join Date: Aug 2011
Location: Slovenia
Photos: Gallery
Posts: 73
Another PK lens in the making

To resurrect this thread once more, I'm in the process of converting a Sigma 180 F2.8 Apo Macro (the old, mf one) from c/y mount to pk. The initial plan was just to swap bayonets so the camera would still operate the aperture lever and allow for open-aperture metering, but as the aperture lever on the lens was bent and sticking I decided to remove it all to be compatible also with my 5d mkII. It's pretty straight forward with simply removing the mount and scrapping the control levers and other unnecessary bits. Aperture ring stays untouched, so it's not much fiddling around with it.

I had 3 potential donor pk bayonets from various crappy old lenses and tc's, but none of the fit well so I had to cannibalise my beloved K55 1.8, which has a very similar bayonet and only needs re-drilling of 2 holes for the mount screws. That stage awaits for tomorrow, as I need to get to a machine shop because.

Made a few quick test shots with only one mount screw in to try infinity, and it looks it's more or less spot on, so really looking forward to do some proper pics with it. For now it looks really sharp eve at 2.8 with really nice colour rendition.


  • 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!
c/y, 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
adapters for non-K-mount lenses to Pentax K-mount DSLRs: new dimensions for LBA Douglas_of_Sweden Pentax Camera and Field Accessories 152 07-29-2017 05:47 AM
Hey new here, quick question, is this K mount or M42 Screw Mount? Lulerfly Pentax SLR Lens Discussion 8 11-02-2010 11:58 PM
Need words of wisdom from users of T-mount adapter for K mount. Graystar Pentax SLR Lens Discussion 5 01-27-2010 05:21 PM

All times are GMT -7. The time now is 05:27 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]