Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
11-08-2012, 10:38 PM   #16
Veteran Member
sam-joseph's Avatar

Join Date: Oct 2009
Location: Newcastle, NSW, Australia
Photos: Gallery
Posts: 1,086
This is what mine looks like. Either you've got too many holes in yours or I'm missing one. The contact pin looks like a little ball bearing.
Unfortunately I've just realised I seem to have a sticking aperture blade. Thanks for bringing my attention to that...


12-17-2012, 04:19 PM   #17
New Member

Join Date: Nov 2012
Posts: 9
Original Poster
QuoteOriginally posted by jamesm007 Quote
The contact pin is in the wrong hole. I can tell by looking at the screws and lens retainer someone took this lens apart before and when they put it back together things gut ugly. Take a look at all Pentax A only primes as yours. What you are missing is the little white cap that goes where the contact is now. You can try to move the contact over by removing the back cover very carefully. Have a magnet pickup tool ready. A small steel ball will come out and perhaps a spring or two. Thats what happened last time. But just remove the cover slow and aperture ring slow. The steel ball you don't see that I am talking about provided the clicks as you move the aperture ring.

I see others give you links to repair. But just know its in the wrong hole!
@jamesm007 - well spotted & thanks very much. I'll see what I can do to fix it over Christmas.

12-17-2012, 04:37 PM   #18
Veteran Member

Join Date: Sep 2010
Posts: 469
I got one of these in the mail today and it had a broken off leaf spring inside. There is no hole or brass looking thing as seen here in the 1:30 position. The empty hole here is the A pin and there is only one insulating plug as seen above.

The pieces missing are not identical to those in the A f1:2.0 version but they can be made to fit with some judicious clipping and filing. I know because the 1.7 and the 1.4 are the same and I put 2.0 parts in my 1.4.

12-17-2012, 04:40 PM   #19
Veteran Member

Join Date: Sep 2010
Posts: 469
Taking a look at an A 2.0 I see that there is an insulator where the brass bit is in the OP's lens. The mount must have been changed at one time or another. Interesting that the metal plug was inserted but the A pin was not. I bet it went sproing on reassembly.

Edit: The two on the left are 2.0 and the one on the right is the 1.7

Attached Images

Last edited by aoeu; 12-17-2012 at 04:51 PM. Reason: Added pic

  • 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!
50mm, f1.7, gx20, pentax help, pentax-a, pentax-a 50mm f1.7, smc pentax-a 50mm
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
SMC Pentax A 50mm F1.7 Samples alan_smithee_photos Lens Sample Photo Archive 9 02-24-2015 11:36 PM
SMC Pentax-M 50mm F1.7 focus problem? Deano1969 Pentax SLR Lens Discussion 9 06-17-2011 12:04 PM
For Sale - Sold: SMC Pentax-A 50mm F1.7 occhicone98 Sold Items 3 02-19-2011 11:42 AM
My Poor smc Pentax-M 50mm f1.7 (Aperture Blade Problem...) AaronBHicks Pentax SLR Lens Discussion 7 01-30-2011 11:00 AM

All times are GMT -7. The time now is 01:48 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]