Pentax-A 28 mm f2.8 contact missing

jamesw1008 · 01-03-2011, 11:02 AM

I recently removed my Pentax-A 28 mm f2.8 from my K100D and the little retractable 'A' contact and its spring popped out. I found the contact but the spring is gone forever. The lens still works fine, but not in 'A' mode. The viewfinder displays F-- for the aperture. What are the repair options? I removed the 5 screws holding the mount to the lens body and it appears as though I could just replace the spring (if I had one). Anyone have experience with this? Any sources for replacement springs or do I have to find and cannibalize another lens? Thanks for any suggestions!

JeffJS · 01-03-2011, 03:50 PM

If the pin just 'popped out' then there is a grommet missing or broken as well. It's a little white washer looking thing on the inside of the lens mount. As for a replacement spring, don't know for sure but you can try this place..

SmallParts.com: The Hardware Store for Researchers and Developers

You might also try these people.

Micro-Tools, Camera & Watch Repair Tools - Home

gp1806 · 01-04-2011, 07:37 AM

Look on ebay for a broken lens to get parts. It would not have to be the exact same lens. Some old zooms sell for cheap. Look for an 'A' zoom.

jamesw1008 · 01-04-2011, 10:54 AM

Thanks for the info/suggestions. I'll see if I can find a broken lens locally for donor parts. If I can't find anything I'll try ebay or perhaps the spring vendors you mention.

eddie1960 · 01-04-2011, 11:12 AM

and if worse comes to worse you are now the proud owner of an m series 28 f2.8 (not a bbad thing at all, though a little more tedious to use)

**Just1MoreDave** · 01-05-2011, 04:32 PM

This post has some photos of what the contact looks like on the A50/1.7, with some information on putting it back together. It also has the Pentax part number, for the part, not necessarily the spring. I don't see how this contact would ever fall out by itself. I don't know if the A28/2.8 has a different contact or your lens was modified - possibly someone just used a ball bearing and spring instead of the proper part?

The SmallParts.com site is cool. I found a lot of stuff to order from them!

01-03-2011, 11:02 AM	#1
jamesw1008 New Member Join Date: Jan 2011 Location: Monument, CO Posts: 2	Pentax-A 28 mm f2.8 contact missing I recently removed my Pentax-A 28 mm f2.8 from my K100D and the little retractable 'A' contact and its spring popped out. I found the contact but the spring is gone forever. The lens still works fine, but not in 'A' mode. The viewfinder displays F-- for the aperture. What are the repair options? I removed the 5 screws holding the mount to the lens body and it appears as though I could just replace the spring (if I had one). Anyone have experience with this? Any sources for replacement springs or do I have to find and cannibalize another lens? Thanks for any suggestions!

01-04-2011, 10:54 AM	#4
jamesw1008 New Member Join Date: Jan 2011 Location: Monument, CO Posts: 2 Original Poster	Thanks for the info/suggestions Thanks for the info/suggestions. I'll see if I can find a broken lens locally for donor parts. If I can't find anything I'll try ebay or perhaps the spring vendors you mention.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Contact info of Pentax Canada service?	bdery	Pentax SLR Lens Discussion	10	11-26-2015 11:22 AM
Pentax MV: Missing Rewind Knob	Imperatrix	Film SLRs and Compact Film Cameras	8	09-14-2010 04:00 AM
Pentax ME-F losing its battery contact	fearview	Film SLRs and Compact Film Cameras	12	11-10-2009 06:36 AM
Pentax VS the World: Am I Missing Something Here?	Biff	Pentax DSLR Discussion	50	07-13-2009 08:22 PM
Pentax DNG Math Error? Know how to contact Ned Bunnell ASAP?	solar1	Pentax DSLR Discussion	1	03-02-2008 09:10 PM

01-03-2011, 03:50 PM	#2
JeffJS Inactive Account Join Date: Aug 2008 Location: Michigan, USA Photos: Gallery \| Albums Posts: 7,484	If the pin just 'popped out' then there is a grommet missing or broken as well. It's a little white washer looking thing on the inside of the lens mount. As for a replacement spring, don't know for sure but you can try this place.. SmallParts.com: The Hardware Store for Researchers and Developers You might also try these people. Micro-Tools, Camera & Watch Repair Tools - Home

01-04-2011, 07:37 AM	#3
gp1806 Veteran Member Join Date: Mar 2009 Location: Chicago suburbs Photos: Albums Posts: 848	Look on ebay for a broken lens to get parts. It would not have to be the exact same lens. Some old zooms sell for cheap. Look for an 'A' zoom.

01-04-2011, 11:12 AM	#5
eddie1960 Veteran Member Join Date: Aug 2010 Location: Toronto Photos: Gallery \| Albums Posts: 13,667	and if worse comes to worse you are now the proud owner of an m series 28 f2.8 (not a bbad thing at all, though a little more tedious to use)

01-05-2011, 04:32 PM	#6
Just1MoreDave Site Supporter Join Date: Feb 2007 Location: Aurora, CO Photos: Gallery \| Albums Posts: 6,340	This post has some photos of what the contact looks like on the A50/1.7, with some information on putting it back together. It also has the Pentax part number, for the part, not necessarily the spring. I don't see how this contact would ever fall out by itself. I don't know if the A28/2.8 has a different contact or your lens was modified - possibly someone just used a ball bearing and spring instead of the proper part? The SmallParts.com site is cool. I found a lot of stuff to order from them!