What mount is on this lens?

**goatsNdonkey** · 11-23-2016, 10:00 AM

It looks sort of like a K-mount, but with a pin like the aperture actuator pin on a Pentax screw mount...and then there's that springy looking thing angling out from the one side?

It definitely doesn't look like the Konica AR mount, which sometimes gets confused with the K-mount.

It doesn't look like Nikon mount pictures I've found.

Here's a picture, does anybody know?

**sergysergy** · 11-23-2016, 10:04 AM

I would say it is M42 with a K adapter

photoptimist · 11-23-2016, 10:04 AM

That looks like an M42-K-mount adapter stuck on an M42 lens. It should just unscrew.

bertwert · 11-23-2016, 10:06 AM

I concur with the previous replies. M42 to K adapter on M42 lens.

**goatsNdonkey** · 11-23-2016, 10:11 AM - **1 Like**

sergysergy, photoptimist & bertwert--

NOW I SEE -- I feel like Biblical scales have fallen from my eyes! Of course, that is what it is! I've heard of people attaching the adapters TO THE LENS, but, silly me, I always follow the directions and mount the adapter in the camera, and then mount the m42 lens. Consequently, I've never seen what the bottom of an m42 lens looks like with just the adapter on it.

Don't you need to remove the spring to change the lens's mount that way? I'd think the spring would keep you from removing the lens...at least in a nice way

bertwert · 11-23-2016, 10:12 AM

Originally posted by goatsNdonkey

Don't you need to remove the spring to change the lens's mount that way? I'd think the spring would keep you from removing the lens...at least in a nice way

Correct.

**goatsNdonkey** · 11-23-2016, 10:24 AM

Maybe the adapter is just being stored on the lens. I'd hate to think the lens and adapter were violently ripped from a camera. Criminy sakes!

photoptimist · 11-23-2016, 10:25 AM

Originally posted by goatsNdonkey

sergysergy, photoptimist & bertwert--

NOW I SEE -- I feel like Biblical scales have fallen from my eyes! Of course, that is what it is! I've heard of people attaching the adapters TO THE LENS, but, silly me, I always follow the directions and mount the adapter in the camera, and then mount the m42 lens. Consequently, I've never seen what the bottom of an m42 lens looks like with just the adapter on it.

Don't you need to remove the spring to change the lens's mount that way? I'd think the spring would keep you from removing the lens...at least in a nice way

The only thing that keeps the adapter on the M42 lens is friction. The adapter does have a spring (that little tab on the left side of the picture) but that is supposed to lock the adapter into the throat of the camera's K-mount.

**goatsNdonkey** · 11-23-2016, 10:41 AM

Originally posted by photoptimist

The only thing that keeps the adapter on the M42 lens is friction. The adapter does have a spring (that little tab on the left side of the picture) but that is supposed to lock the adapter into the throat of the camera's K-mount.

Yes, I have two of the original Pentax m42 to K adapters. You have to depress the spring inside the mount in order to get the adapter out of the camera.

I have heard of people removing the spring and attaching the adapter to a favorite m42 lens with some sort of adhesive, in order to convert the lens to K-mount.

gifthorse · 11-23-2016, 01:35 PM

The retainer (that springy looking thing) is easily removed from the adapter. There should be a screw at the base of the retainer that attaches the retainer to the adapter.

**goatsNdonkey** · 11-23-2016, 02:15 PM

Originally posted by gifthorse

The retainer (that springy looking thing) is easily removed from the adapter. There should be a screw at the base of the retainer that attaches the retainer to the adapter.

Better a screw than a rivet! The spring could be put back with a screw.

I'm personally not planning to do any of this to an M42-PK adapter.

ZombieArmy · 11-27-2016, 11:34 PM

I personally remove the springs from these so I can just leave the adapter on the lens and swap out easily. Seems odd to leave it like that with the spring on though, probably just for storage?

11-23-2016, 10:00 AM	#1
goatsNdonkey Site Supporter Join Date: Jan 2016 Location: Fulton County, Illinois Posts: 3,727	What mount is on this lens? It looks sort of like a K-mount, but with a pin like the aperture actuator pin on a Pentax screw mount...and then there's that springy looking thing angling out from the one side? It definitely doesn't look like the Konica AR mount, which sometimes gets confused with the K-mount. It doesn't look like Nikon mount pictures I've found. Here's a picture, does anybody know?

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11-23-2016, 10:04 AM	#2
sergysergy Site Supporter Join Date: Jan 2011 Photos: Gallery Posts: 5,170	I would say it is M42 with a K adapter

11-23-2016, 10:04 AM	#3
photoptimist Pentaxian Join Date: Jul 2016 Photos: Albums Posts: 5,122	That looks like an M42-K-mount adapter stuck on an M42 lens. It should just unscrew.

11-23-2016, 10:06 AM	#4
bertwert Veteran Member Join Date: Jun 2015 Location: Golden, BC Posts: 15,173	I concur with the previous replies. M42 to K adapter on M42 lens.

11-23-2016, 10:11 AM - 1 Like	#5
goatsNdonkey Site Supporter Join Date: Jan 2016 Location: Fulton County, Illinois Posts: 3,727 Original Poster	sergysergy, photoptimist & bertwert-- NOW I SEE -- I feel like Biblical scales have fallen from my eyes! Of course, that is what it is! I've heard of people attaching the adapters TO THE LENS, but, silly me, I always follow the directions and mount the adapter in the camera, and then mount the m42 lens. Consequently, I've never seen what the bottom of an m42 lens looks like with just the adapter on it. Don't you need to remove the spring to change the lens's mount that way? I'd think the spring would keep you from removing the lens...at least in a nice way

11-23-2016, 10:12 AM	#6
bertwert Veteran Member Join Date: Jun 2015 Location: Golden, BC Posts: 15,173	Originally posted by goatsNdonkey Don't you need to remove the spring to change the lens's mount that way? I'd think the spring would keep you from removing the lens...at least in a nice way Correct.

11-23-2016, 10:24 AM	#7
goatsNdonkey Site Supporter Join Date: Jan 2016 Location: Fulton County, Illinois Posts: 3,727 Original Poster	Maybe the adapter is just being stored on the lens. I'd hate to think the lens and adapter were violently ripped from a camera. Criminy sakes!

11-23-2016, 10:25 AM	#8
photoptimist Pentaxian Join Date: Jul 2016 Photos: Albums Posts: 5,122	Originally posted by goatsNdonkey sergysergy, photoptimist & bertwert-- NOW I SEE -- I feel like Biblical scales have fallen from my eyes! Of course, that is what it is! I've heard of people attaching the adapters TO THE LENS, but, silly me, I always follow the directions and mount the adapter in the camera, and then mount the m42 lens. Consequently, I've never seen what the bottom of an m42 lens looks like with just the adapter on it. Don't you need to remove the spring to change the lens's mount that way? I'd think the spring would keep you from removing the lens...at least in a nice way The only thing that keeps the adapter on the M42 lens is friction. The adapter does have a spring (that little tab on the left side of the picture) but that is supposed to lock the adapter into the throat of the camera's K-mount.

11-23-2016, 10:41 AM	#9
goatsNdonkey Site Supporter Join Date: Jan 2016 Location: Fulton County, Illinois Posts: 3,727 Original Poster	Originally posted by photoptimist The only thing that keeps the adapter on the M42 lens is friction. The adapter does have a spring (that little tab on the left side of the picture) but that is supposed to lock the adapter into the throat of the camera's K-mount. Yes, I have two of the original Pentax m42 to K adapters. You have to depress the spring inside the mount in order to get the adapter out of the camera. I have heard of people removing the spring and attaching the adapter to a favorite m42 lens with some sort of adhesive, in order to convert the lens to K-mount.

11-23-2016, 01:35 PM	#10
gifthorse Pentaxian Join Date: Dec 2011 Location: Nevada Photos: Gallery Posts: 2,945	The retainer (that springy looking thing) is easily removed from the adapter. There should be a screw at the base of the retainer that attaches the retainer to the adapter.

11-23-2016, 02:15 PM	#11
goatsNdonkey Site Supporter Join Date: Jan 2016 Location: Fulton County, Illinois Posts: 3,727 Original Poster	Originally posted by gifthorse The retainer (that springy looking thing) is easily removed from the adapter. There should be a screw at the base of the retainer that attaches the retainer to the adapter. Better a screw than a rivet! The spring could be put back with a screw. I'm personally not planning to do any of this to an M42-PK adapter.

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11-27-2016, 11:34 PM	#12
ZombieArmy Pentaxian Join Date: Jun 2014 Location: Florida Posts: 3,210	I personally remove the springs from these so I can just leave the adapter on the lens and swap out easily. Seems odd to leave it like that with the spring on though, probably just for storage?