M42 adapter stuck on lens

I got a M42 adapter on ebay. Tried it on my k20d. Took a few photos. With some difficulty removed it from the camera. I thought I can keep it safe by attaching it to the lens (a 105mm f2.8 Takumar). After screwing it to the lens, I realized I have attached it the wrong way. When I tried to unscrew it, found that it is stuck to the lens. There seems to be a small pin like projection on the lens which is preventing the adapter from rotating when I try to unscrew. I have spent over an hour to remove the adapter in vain. Does anyone here know how to remove the adapter?
Thanks

Try a Google search while you wait. Get a genuine Pentax adapter. They always work.

Ta Da: http://forums.dpreview.com/forums/read.asp?forum=1036&message=33199781

Thanks for your suggestion. I searched google. I only find reports of the adapter getting stuck on the camera mount and not on the lens as is my case. I thought posting a question on this forum will get me a quicker answer.

Les Lammers said:

Try a Google search while you wait. Get a genuine Pentax adapter. They always work.

Ta Da: http://forums.dpreview.com/forums/read.asp?forum=1036&message=33199781

Click to expand...

muraliy said:

After screwing it to the lens, I realized I have attached it the wrong way.

Click to expand...

Please explain "the wrong way." A photo would be great.

If you spin the adapter the wrong way (e.g. counterclockwise instead of clockwise), how can the adapter go in the thread on the lens? Are the threads on the lens and on the adapter crossed?

muraliy said:

There seems to be a small pin like projection on the lens which is preventing the adapter from rotating when I try to unscrew.

Click to expand...

I happen to have a SMC Takumar 135mm 1:2.5 and a genuine Pentax adapter here. This lens has two pins:

1. The pin to activate the aperture blade (related to auto/manual switch). This pin is located well inside the adapter. This pin can not have anything to do with attaching/removing the adapter.

2. The pin to allow the auto/manual switch to be set at "auto" when the lens is off-camera. On my lens, this pin is directly underneath the adapter and sticks out about 0.5 mm. I can see that if this pin sticks out too far, it can prevent the adapter from turning and thus the adapter can not be removed. But it's easy to depress this pin with a toothpick or the tip of a ballpoint pen if needed.

Note that pin #2 exists only on SMC (or Super-Multi-Coated) Takuma lenses. There lenses allow full-aperture metering on SP F, SP ES, ... bodies.

muraliy said:

I have spent over an hour to remove the adapter in vain. Does anyone here know how to remove the adapter?

Click to expand...

Don't force it too much. But if you need to hold on to the adapter easier, use a PK-mount lens cap.

soldbear said:

muraliy said:

After screwing it to the lens, I realized I have attached it the wrong way.

Click to expand...

Please explain "the wrong way." A photo would be great.

Click to expand...

By "wrong way", I mean, I have screwed the lens to the end of the adapter which should face the camera mount .Put it other way, the adapter's end that should be flush with the camera mount is now attached to the lens. With the adapter attached to the lens now it cannot be mounted on the camera. I hope you get the picture. I am right now at work and away from my camera. I will try to post a picture when I go home tonight.

soldbear said:

If you spin the adapter the wrong way (e.g. counterclockwise instead of clockwise), how can the adapter go in the thread on the lens? Are the threads on the lens and on the adapter crossed?

Click to expand...

No, the threads have not crossed.

soldbear said:

soldbear said:

There seems to be a small pin like projection on the lens which is preventing the adapter from rotating when I try to unscrew.

Click to expand...

I happen to have a SMC Takumar 135mm 1:2.5 and a genuine Pentax adapter here. This lens has two pins:

1. The pin to activate the aperture blade (related to auto/manual switch). This pin is located well inside the adapter. This pin can not have anything to do with attaching/removing the adapter.

2. The pin to allow the auto/manual switch to be set at "auto" when the lens is off-camera. On my lens, this pin is directly underneath the adapter and sticks out about 0.5 mm. I can see that if this pin sticks out too far, it can prevent the adapter from turning and thus the adapter can not be removed. But it's easy to depress this pin with a toothpick or the tip of a ballpoint pen if needed.

Click to expand...

The "pin like projection" I said in my first post is really not a pin that can be depressed. It seems to be just a small projection in the lens. I need to look at it more carefully and see if I can take a picture of it that can explain what I mean better.

soldbear said:

Note that pin #2 exists only on SMC (or Super-Multi-Coated) Takuma lenses. There lenses allow full-aperture metering on SP F, SP ES, ... bodies.

soldbear said:

I have spent over an hour to remove the adapter in vain. Does anyone here know how to remove the adapter?

Click to expand...

Don't force it too much. But if you need to hold on to the adapter easier, use a PK-mount lens cap.

Click to expand...

I cannot attach a PK-mount lens for the reason that the adapter is mounted on the other end.

These soldbear's tips are very good...

soldbear said:

I happen to have a SMC Takumar 135mm 1:2.5 and a genuine Pentax adapter here. This lens has two pins:

1. The pin to activate the aperture blade (related to auto/manual switch). This pin is located well inside the adapter. This pin can not have anything to do with attaching/removing the adapter.

2. The pin to allow the auto/manual switch to be set at "auto" when the lens is off-camera. On my lens, this pin is directly underneath the adapter and sticks out about 0.5 mm. I can see that if this pin sticks out too far, it can prevent the adapter from turning and thus the adapter can not be removed. But it's easy to depress this pin with a toothpick or the tip of a ballpoint pen if needed.

Note that pin #2 exists only on SMC (or Super-Multi-Coated) Takuma lenses. There lenses allow full-aperture metering on SP F, SP ES, ... bodies.

soldbear said:

I have spent over an hour to remove the adapter in vain. Does anyone here know how to remove the adapter?

Click to expand...

Click to expand...

...But if you really feel that nothing works, here are couple of my tips more:



Note 2. (in picture above): Tongs--> I mean this kind of Needle-nose pliers



Ari
--

• Ari Aikomus -

'Why should I feel lonely ? is not our planet in the Milky way?'

Thanks for the additional info. Now I understand a bit better.

So here's the situation with your lens & adapter (I'm using a Pentax 135mm 1:2.5 and a Pentax adapter):



Here's the close-up of the pin #2 (red arrow) in my previous post:



The pin does prevent the adapter from rotating. But I can easily press the pin down with the blade of my Swiss Army knife and get the adapter out.

Please post back. I'm curious.

Thanks.

BTW, at the moment I have my K10D with the DA40, not good for a macro photo, so I used my newly acquired (used) Ricoh GX200. I'm impressed with its macro capability.

Hi,

Thank you for your help and very helpful photos. In fact, after reading your first reply I went home and did exactly what you described in your last post and was able to remove the adapter. I used a swiss army knife to depress the pin and then could unscrew the adapter. I have ordered a pentax adapter from pentax website. I will wait for that adapter now before using my M42 lenses!

Finally, congrats on your new (used) Ricoh GX200. The macro photos are great! Now you have rekindled my LBA. It hurts!

soldbear said:

Thanks for the additional info. Now I understand a bit better.

So here's the situation with your lens & adapter (I'm using a Pentax 135mm 1:2.5 and a Pentax adapter):



Here's the close-up of the pin #2 (red arrow) in my previous post:



The pin does prevent the adapter from rotating. But I can easily press the pin down with the blade of my Swiss Army knife and get the adapter out.

Please post back. I'm curious.

Thanks.

BTW, at the moment I have my K10D with the DA40, not good for a macro photo, so I used my newly acquired (used) Ricoh GX200. I'm impressed with its macro capability.

Click to expand...