Pentax-F 50mm filter ring fix

Khoff2 · 02-17-2012, 04:03 PM

Ok, so here are the results of my new (well used) 50mm F 1.7 lens. First of all, thank you very everyone's help and suggestions. This site has been a HUGE help. I received this lens from KEH for $159. It was advertised as a chipped filter ring, no picture. It ended up being a little more than a chipped filter ring - more like missing half of the filter ring. Probably should have been less than what I paid since it had no lens caps either, but oh well. My fix was adding a 49mm to 52mm adapter ring. This way I can interchange the lens caps and filters with my kits lenses. It ended up screwing right on without any modifying (even with 1/2 threads left). I then added a 52mm rubber hood which covered most of the thread gap. My reason for this lens was taking indoor action pictures of my son's TaeKwonDo tournaments. The last time I shot his tournament, I used the kit lens, and had to shoot at high ISO 3200 to get a decent shutter speed. I was a little discouraged. So, after reading, bidding, and fixing, the results of this lens are amazing. I shot in Sv mode with a 800 ISO dialed in. The results were a 1/800 shutter speed at F2.5. Totally awesome! Here are some of the pics:

F 50mm 1.7 - a set on Flickr

ATA Tournament 02/2012 - a set on Flickr

Adam · 02-18-2012, 12:37 AM

That's a pretty clever! Not a bad deal for the lens, either- it's quite sharp, after all

ultraviolet · 02-18-2012, 03:56 PM

Originally posted by Khoff2

ATA Tournament 02/2012 - a set on Flickr

A shorter and/or wider hood will remove the vignetting issue.

Khoff2 · 02-18-2012, 07:56 PM

The vignetting was added post processing

frank · 02-19-2012, 12:50 AM

Did the same on my copy

But I used super glue to fix the 49-52mm step ring on to the filter rim (the left-over of it), and reinforced the connetion by using transparent tape, so I don't need to worry about breaking off the rest of the fiter rim later on

I don't use any other hood though 'cause the lens is like having a built-in hood already, especially w/ the step-up ring on.

Khoff2 · 02-19-2012, 08:09 AM

I had planned on using super glue as well, but once I screwed on the adapter - it was solid. I got the hood so I can interchange it with my other 52mm lenses. But, you're right, it probably doesn't need one.

frank · 02-19-2012, 06:24 PM

Originally posted by Khoff2

I had planned on using super glue as well, but once I screwed on the adapter - it was solid. I got the hood so I can interchange it with my other 52mm lenses. But, you're right, it probably doesn't need one.

I glued mine because the broken piece is a bit longer than yours, actually mine only had about half of the filter rim left. A filter or step-up ring just didn't stay on

And I could see the left-over half had some small cracks too, probably wouldn't last long if I didn't do something on it.

Now it's very secure after the plastic surgery

aoleg · 02-20-2012, 10:27 PM

Now tell me plastic bayonets in modern DA lenses are not evil. What'll happen to them in 10 years?

02-17-2012, 04:03 PM	#1
Khoff2 Forum Member Join Date: Nov 2011 Location: Dallas, TX Photos: Gallery \| Albums Posts: 84	Pentax-F 50mm filter ring fix Ok, so here are the results of my new (well used) 50mm F 1.7 lens. First of all, thank you very everyone's help and suggestions. This site has been a HUGE help. I received this lens from KEH for $159. It was advertised as a chipped filter ring, no picture. It ended up being a little more than a chipped filter ring - more like missing half of the filter ring. Probably should have been less than what I paid since it had no lens caps either, but oh well. My fix was adding a 49mm to 52mm adapter ring. This way I can interchange the lens caps and filters with my kits lenses. It ended up screwing right on without any modifying (even with 1/2 threads left). I then added a 52mm rubber hood which covered most of the thread gap. My reason for this lens was taking indoor action pictures of my son's TaeKwonDo tournaments. The last time I shot his tournament, I used the kit lens, and had to shoot at high ISO 3200 to get a decent shutter speed. I was a little discouraged. So, after reading, bidding, and fixing, the results of this lens are amazing. I shot in Sv mode with a 800 ISO dialed in. The results were a 1/800 shutter speed at F2.5. Totally awesome! Here are some of the pics: F 50mm 1.7 - a set on Flickr ATA Tournament 02/2012 - a set on Flickr

02-18-2012, 12:37 AM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,597	That's a pretty clever! Not a bad deal for the lens, either- it's quite sharp, after all Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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02-18-2012, 03:56 PM	#3
ultraviolet Pentaxian Join Date: May 2010 Photos: Albums Posts: 687	Originally posted by Khoff2 ATA Tournament 02/2012 - a set on Flickr A shorter and/or wider hood will remove the vignetting issue.

02-18-2012, 07:56 PM	#4
Khoff2 Forum Member Join Date: Nov 2011 Location: Dallas, TX Photos: Gallery \| Albums Posts: 84 Original Poster	The vignetting was added post processing

02-19-2012, 12:50 AM	#5
frank Veteran Member Join Date: Nov 2006 Location: Singapore Photos: Gallery Posts: 3,202	Did the same on my copy But I used super glue to fix the 49-52mm step ring on to the filter rim (the left-over of it), and reinforced the connetion by using transparent tape, so I don't need to worry about breaking off the rest of the fiter rim later on I don't use any other hood though 'cause the lens is like having a built-in hood already, especially w/ the step-up ring on.

02-19-2012, 08:09 AM	#6
Khoff2 Forum Member Join Date: Nov 2011 Location: Dallas, TX Photos: Gallery \| Albums Posts: 84 Original Poster	I had planned on using super glue as well, but once I screwed on the adapter - it was solid. I got the hood so I can interchange it with my other 52mm lenses. But, you're right, it probably doesn't need one.

02-19-2012, 06:24 PM	#7
frank Veteran Member Join Date: Nov 2006 Location: Singapore Photos: Gallery Posts: 3,202	Originally posted by Khoff2 I had planned on using super glue as well, but once I screwed on the adapter - it was solid. I got the hood so I can interchange it with my other 52mm lenses. But, you're right, it probably doesn't need one. I glued mine because the broken piece is a bit longer than yours, actually mine only had about half of the filter rim left. A filter or step-up ring just didn't stay on And I could see the left-over half had some small cracks too, probably wouldn't last long if I didn't do something on it. Now it's very secure after the plastic surgery

02-20-2012, 10:27 PM	#8
aoleg Junior Member Join Date: Jan 2009 Location: Berlin, DE Posts: 30	Now tell me plastic bayonets in modern DA lenses are not evil. What'll happen to them in 10 years?