Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-23-2009, 04:07 AM   #1
Site Supporter




Join Date: Dec 2006
Posts: 61
Why Pentax F TC X1.7 not work on M42 lens?

Just curious this TC doesn't work on M42 lens as stated on the manual of this TC.
Are there technical issues so only work w specific lens?.
Many thanks,
RTogog

11-23-2009, 04:13 AM   #2
Pentaxian
Asahiflex's Avatar

Join Date: Jan 2008
Location: Netherlands
Photos: Gallery
Posts: 2,754
QuoteOriginally posted by RTogog Quote
Just curious this TC doesn't work on M42 lens as stated on the manual of this TC.
Are there technical issues so only work w specific lens?.
I believe the contacts on the AF adapter need to be shorted in order to make it work. A k-mount lens will short the contacts, but some M42 lenses are smaller or the back of the lens does not reach the contacts, or the back of the M42 lens is not conductive.
11-23-2009, 04:31 AM   #3
Veteran Member
pcarfan's Avatar

Join Date: Sep 2007
Location: Dayton, Ohio
Photos: Gallery | Albums
Posts: 2,958
I don't think it says in the manual that it will AF with M42 lenses, does it?....When I had mine, I had to short the circuits with a foil and then The AFA will AF the m42 lenses, and even does P-TTL flash.
11-23-2009, 05:39 AM   #4
Site Supporter




Join Date: Dec 2006
Posts: 61
Original Poster
QuoteOriginally posted by pcarfan Quote
I don't think it says in the manual that it will AF with M42 lenses, does it?....When I had mine, I had to short the circuits with a foil and then The AFA will AF the m42 lenses, and even does P-TTL flash.
It is true on the manual stated that will not work w m42 lens. How did you do? patch it w foil on the m42 lens? I 've tried directly put a m42 to K adapter on the lens directly but still doesn't work?

11-23-2009, 05:48 AM   #5
Veteran Member
pcarfan's Avatar

Join Date: Sep 2007
Location: Dayton, Ohio
Photos: Gallery | Albums
Posts: 2,958
QuoteOriginally posted by RTogog Quote
It is true on the manual stated that will not work w m42 lens. How did you do? patch it w foil on the m42 lens? I 've tried directly put a m42 to K adapter on the lens directly but still doesn't work?
The electrical contacts have to be shorted on the camera. So place a foil over the electrical connections on the camera and burnish the foil so the sunken contact touches the foil as well. And then attach the lens making sure the foil doesn't move.

I did not like this method as there are shreds of foil that falls into the camera. I tried to scrape the metal of the lens barrel to make contact. It didn't work for me, some say it works for them, but I can't see how the barrel will ever make contact with the sunken contact. Some say the M42-K adapter with the flange which doesn't allow for infinity focus will short the circuit. I didn't try this, but again I don't see how that sunken electrical contact will touch the flange ?

I've long since sold the AFA and all my MF lenses.
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!
k-mount, m42, pentax f tc, pentax lens, slr lens, tc, tc x1.7
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
slr pentax lens... work in a dslr? CEWren Pentax SLR Lens Discussion 16 09-02-2010 06:23 AM
Nikon to Pentax Lens Adapter- Does it Work? seachunk2 Pentax SLR Lens Discussion 19 05-06-2010 10:16 AM
Pentax SLR lens work with Pentax DSLR ? thehitmen Troubleshooting and Beginner Help 4 11-01-2009 09:53 PM
Will this M42 to K adapter work ? thanks. pcarfan Pentax Camera and Field Accessories 5 01-28-2009 02:07 PM
Do All M42 lenses work on Pentax with an adapter.. throndor Pentax SLR Lens Discussion 16 09-16-2008 06:00 AM



All times are GMT -7. The time now is 04:34 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