T ring

cg-4k50 · 05-27-2019, 10:43 AM

Hello all, I just bought a 135mm lens, its old and from sears made in Japan , Seems to be a sharp lens but cant focus to infinity .I need a few more mm of in focus.
Is there a low profile T ring for the K50 ? or other way to mount this lens Thanks

Last edited by cg-4k50; 05-27-2019 at 01:02 PM.

**.a.t.** · 05-27-2019, 03:33 PM - **1 Like**

Originally posted by cg-4k50

Hello all . . .

Could we see a picture of your lens, its mount and the T ring or adapter you're currently using?

Not a Number · 05-27-2019, 03:39 PM

What mount is on the lens? A T-adapter is only going to have a fixed length depending on the lens mount on the body. T-adapters will only fit on T-mount lenses.

Adding extension will move the focus closer.

Is it a screw mount (M42) lens and are you using an adapter with a flange? These adapters will not focus to infinity without adjusting the lens. Use a flange-less or "sunken" adapter like the genuine Pentax M42 adapter.

If the lens is for K-mount then perhaps a previous owner adjusted the infinity stop for use on a Canon or Nikon body. You would have to readjust the setting.

cg-4k50 · 05-27-2019, 05:33 PM

Originally posted by Not a Number

What mount is on the lens? A T-adapter is only going to have a fixed length depending on the lens mount on the body. T-adapters will only fit on T-mount lenses.

Adding extension will move the focus closer.

Is it a screw mount (M42) lens and are you using an adapter with a flange? These adapters will not focus to infinity without adjusting the lens. Use a flange-less or "sunken" adapter like the genuine Pentax M42 adapter.

If the lens is for K-mount then perhaps a previous owner adjusted the infinity stop for use on a Canon or Nikon body. You would have to readjust the setting.

Thanks for the reply, yes a screw in mount ,My T ring has a flange I use it for AP ,found the right one thanks

Piotrek K · 05-28-2019, 03:42 AM

Originally posted by cg-4k50

Thanks for the reply, yes a screw in mount ,My T ring has a flange I use it for AP ,found the right one thanks

May I ask you for the link, if possible? I struggle to focus some my cameras with the scope.

cg-4k50 · 05-31-2019, 06:13 AM

Originally posted by Piotrek K

May I ask you for the link, if possible? I struggle to focus some my cameras with the scope.

I went to Amazon ,searched M42 adapter ,several choices

05-27-2019, 10:43 AM	#1
cg-4k50 Junior Member Join Date: Jul 2017 Posts: 36	T ring Hello all, I just bought a 135mm lens, its old and from sears made in Japan , Seems to be a sharp lens but cant focus to infinity .I need a few more mm of in focus. Is there a low profile T ring for the K50 ? or other way to mount this lens Thanks Last edited by cg-4k50; 05-27-2019 at 01:02 PM.

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05-27-2019, 03:33 PM - 1 Like	#2
.a.t. Site Supporter Join Date: Mar 2011 Location: yesterday Photos: Gallery Posts: 1,261	Originally posted by cg-4k50 Hello all . . . Could we see a picture of your lens, its mount and the T ring or adapter you're currently using?

05-27-2019, 03:39 PM	#3
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,525	What mount is on the lens? A T-adapter is only going to have a fixed length depending on the lens mount on the body. T-adapters will only fit on T-mount lenses. Adding extension will move the focus closer. Is it a screw mount (M42) lens and are you using an adapter with a flange? These adapters will not focus to infinity without adjusting the lens. Use a flange-less or "sunken" adapter like the genuine Pentax M42 adapter. If the lens is for K-mount then perhaps a previous owner adjusted the infinity stop for use on a Canon or Nikon body. You would have to readjust the setting.

05-27-2019, 05:33 PM	#4
cg-4k50 Junior Member Join Date: Jul 2017 Posts: 36 Original Poster	Originally posted by Not a Number What mount is on the lens? A T-adapter is only going to have a fixed length depending on the lens mount on the body. T-adapters will only fit on T-mount lenses. Adding extension will move the focus closer. Is it a screw mount (M42) lens and are you using an adapter with a flange? These adapters will not focus to infinity without adjusting the lens. Use a flange-less or "sunken" adapter like the genuine Pentax M42 adapter. If the lens is for K-mount then perhaps a previous owner adjusted the infinity stop for use on a Canon or Nikon body. You would have to readjust the setting. Thanks for the reply, yes a screw in mount ,My T ring has a flange I use it for AP ,found the right one thanks

05-28-2019, 03:42 AM	#5
Piotrek K Pentaxian Join Date: Dec 2012 Photos: Gallery Posts: 1,384	Originally posted by cg-4k50 Thanks for the reply, yes a screw in mount ,My T ring has a flange I use it for AP ,found the right one thanks May I ask you for the link, if possible? I struggle to focus some my cameras with the scope.

05-31-2019, 06:13 AM	#6
cg-4k50 Junior Member Join Date: Jul 2017 Posts: 36 Original Poster	Originally posted by Piotrek K May I ask you for the link, if possible? I struggle to focus some my cameras with the scope. I went to Amazon ,searched M42 adapter ,several choices

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