Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-19-2013, 06:34 AM   #1
New Member




Join Date: Mar 2013
Posts: 3
Catch in focus help

Hello, my name is Cecil , Im new here...my question is, I have been experimenting with the catch in focus feature on my K-x and with a 28mm mf lens it works fine, when I attach my 500mm mf lens it fires as soon as i press the shutter release, neither lens has any contact points for data transmission, but the base on the 28mm is shiny chrome looking, and the 500mm is black metal. Any Ideas?

03-19-2013, 07:11 AM   #2
Pentaxian
carrrlangas's Avatar

Join Date: Mar 2012
Location: Joensuu (Finland)
Photos: Gallery
Posts: 1,750
place a peace of aluminium foil on the mount of your 500mm where the contacts of your DSLR will be. Then it will work the same way.
03-19-2013, 07:49 AM   #3
Site Supporter
Stone G.'s Avatar

Join Date: Jun 2010
Location: North Zealand, Denmark
Photos: Gallery | Albums
Posts: 1,516
QuoteOriginally posted by Halftufish Quote
the base on the 28mm is shiny chrome looking, and the 500mm is black metal.
As indicated by carrrlangas above, the base must be electrically conductive and it must touch the electrical contacts on the body for CIF to work. I guess that your 500mm lens has a T2 mount? If so, it is easy to sand the T2 mount base down to the bare metal where it meets the contacts and make it conductive that way. If it is an M42 mount, things may be a bit more complicated:

https://www.pentaxforums.com/forums/general-technical-troubleshooting/218221-...ution-k-x.html
03-19-2013, 07:56 AM   #4
Pentaxian
carrrlangas's Avatar

Join Date: Mar 2012
Location: Joensuu (Finland)
Photos: Gallery
Posts: 1,750
Thanks Stone G. for your explanation. I recognize I was lazy.
regards

03-29-2013, 05:32 PM   #5
New Member




Join Date: Mar 2013
Posts: 3
Original Poster
Thanks to you both, I thought maybe I could find a t2 mount to k mount in chrome but no luck , i'll try sanding.
03-30-2013, 07:11 AM   #6
Moderator PEG Judges
Kerrowdown's Avatar

Join Date: Aug 2008
Location: Highlands of Scotland.
Photos: Gallery
Posts: 32,682
Do let us all know, how you get on with this issue.
03-31-2013, 03:27 PM   #7
Pentaxian
kh1234567890's Avatar

Join Date: Sep 2010
Location: Manchester, UK
Photos: Gallery
Posts: 2,406
You should only need to short the digital info contact - the one nearest to the 6 o'clock position. With the 500mm lens (mirror ?) the problem is going to be insufficient brightness for the AF system to operate, so unless you've got an unusually fast 500mm you'll never get it to work. The question is - would it work on the K-5ii with slower lenses as the AF system there is supposed to be more sensitive ?
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!
28mm, 500mm, catch, catch in focus, focus, lens, mf, pentax help
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Kx Catch-in-Focus not working duetto96 Troubleshooting and Beginner Help 25 11-25-2013 10:02 AM
Catch in focus help/questions FernandoBatista Pentax DSLR Discussion 23 03-01-2013 07:24 AM
Help! The Bats are Back! Catch In Focus seachunk2 Troubleshooting and Beginner Help 9 07-08-2011 03:21 PM
K7 & catch-in-focus... help! Nass Troubleshooting and Beginner Help 5 09-27-2009 12:36 PM
K2000 catch focus problem (need help!) dragonfly Pentax DSLR Discussion 18 09-16-2009 04:08 PM



All times are GMT -7. The time now is 07:59 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