Change filter ring in an old K lens

barbosas · 02-07-2008, 02:11 PM

Is this a dificult procedure?

I bought a k50 F1.2, the lens barrel is in great condition, except for the filter thread, it's completly unusable.

My ideia is to buy a k55 F2 which also has a 52mm filter diameter and swap it.

Is this a very risky procedure?

thanks

little laker · 02-07-2008, 04:29 PM

It might be tough getting the original off, because you'll have to remove the inner ring with the writing off first. And this is held in place with the filter threads.

That plus the fact that they might not be the same on both lenses.

You can usually use an eraser to get a grip on this ring, and unthread it.

I seriously feel that your better off just finding another 50mm f1.2 in good shape, and using yours as a spare.

Peter Zack · 02-07-2008, 06:07 PM

I was wondering if you could straighten it enough to get a filter ring on it?
I realize that a bend filter ring is hard to take a filter on and off. But I had a lens like this.

What I did was put duct tape on the tips of a pair of pliers (to try and prevent more scratches) and did my best to straighten the bent ring. Then took a filter and removed the glass. Then threaded that on the lens and it took some force to get it on but it finally did. So I used the glassless filter to be the new front threads for CPL's etc. It worked perfectly. Just try to find a filter that has strong sides like the B&W's that are thick.

barbosas · 02-08-2008, 06:08 AM

It's not possible to straighten it up, the thread is ruined all around.

Sometimes it's just a small ding, and it's possible to force the filter, but in this case it's impossible.

Peter Zack · 02-08-2008, 06:39 AM

Well then do you have a camera repair shop anywhere nearby? Maybe take it in to them and see if they have any ideas. That is if Stu's idea won't work either. Otherwise, it sounds like you could only hold a filter (like a Cokin P) in front of the lens.

CGJung · 02-08-2008, 03:21 PM

I think a cheaper solution would be buy a cheap filter with same diameter and bust the glass and stick it in front the lens. You have a fresh thread filter ring.

Originally posted by Peter Zack

Well then do you have a camera repair shop anywhere nearby? Maybe take it in to them and see if they have any ideas. That is if Stu's idea won't work either. Otherwise, it sounds like you could only hold a filter (like a Cokin P) in front of the lens.

02-07-2008, 02:11 PM	#1
barbosas Veteran Member Join Date: Apr 2007 Location: Lisbon Photos: Gallery Posts: 683	Change filter ring in an old K lens Is this a dificult procedure? I bought a k50 F1.2, the lens barrel is in great condition, except for the filter thread, it's completly unusable. My ideia is to buy a k55 F2 which also has a 52mm filter diameter and swap it. Is this a very risky procedure? thanks

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Dented filter ring	PGillin	Pentax SLR Lens Discussion	2	10-13-2010 10:37 PM
Help fixing filter ring.	Swift1	Pentax SLR Lens Discussion	2	12-06-2009 05:19 AM
For Sale - Sold: FS: SMC Pentax-A 50mm f/2 lens with reversal ring and filter	drabina	Sold Items	0	03-11-2008 06:36 AM

02-07-2008, 04:29 PM	#2
little laker Veteran Member Join Date: Sep 2006 Photos: Gallery Posts: 5,697	It might be tough getting the original off, because you'll have to remove the inner ring with the writing off first. And this is held in place with the filter threads. That plus the fact that they might not be the same on both lenses. You can usually use an eraser to get a grip on this ring, and unthread it. I seriously feel that your better off just finding another 50mm f1.2 in good shape, and using yours as a spare.

02-07-2008, 06:07 PM	#3
Peter Zack Pentaxian Moderator Emeritus Join Date: May 2007 Location: Edmonton Alberta, Canada Photos: Gallery \| Albums Posts: 10,643	I was wondering if you could straighten it enough to get a filter ring on it? I realize that a bend filter ring is hard to take a filter on and off. But I had a lens like this. What I did was put duct tape on the tips of a pair of pliers (to try and prevent more scratches) and did my best to straighten the bent ring. Then took a filter and removed the glass. Then threaded that on the lens and it took some force to get it on but it finally did. So I used the glassless filter to be the new front threads for CPL's etc. It worked perfectly. Just try to find a filter that has strong sides like the B&W's that are thick.

02-08-2008, 06:08 AM	#4
barbosas Veteran Member Join Date: Apr 2007 Location: Lisbon Photos: Gallery Posts: 683 Original Poster	It's not possible to straighten it up, the thread is ruined all around. Sometimes it's just a small ding, and it's possible to force the filter, but in this case it's impossible.

02-08-2008, 06:39 AM	#5
Peter Zack Pentaxian Moderator Emeritus Join Date: May 2007 Location: Edmonton Alberta, Canada Photos: Gallery \| Albums Posts: 10,643	Well then do you have a camera repair shop anywhere nearby? Maybe take it in to them and see if they have any ideas. That is if Stu's idea won't work either. Otherwise, it sounds like you could only hold a filter (like a Cokin P) in front of the lens.

02-08-2008, 03:21 PM	#6
CGJung Forum Member Join Date: Nov 2006 Location: St. Louis Posts: 92	I think a cheaper solution would be buy a cheap filter with same diameter and bust the glass and stick it in front the lens. You have a fresh thread filter ring. Originally posted by Peter Zack Well then do you have a camera repair shop anywhere nearby? Maybe take it in to them and see if they have any ideas. That is if Stu's idea won't work either. Otherwise, it sounds like you could only hold a filter (like a Cokin P) in front of the lens.