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06-28-2013, 11:18 PM   #1
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SMC/S-M-C Takumar Compatability Issues

I learned something this evening that really surprised me. As many of you know, the SMC and S-M-C Takumar lenses have a small pin on the mount face that provides an interlock for the aperture mechanism open-aperture metering. Many of you also know that the mount flange on Pentax M42 bodies is smooth with no screw holes. This is not the case with all M42 bodies. Many other brands attach the flange to the body with counter-sunk screws through holes drilled through the face. These other brands include Ricoh, Mamiya/Sekor DTL models, Zenit and who knows what others.

Have you guess the problem yet? That very tiny SMC pin has the potential to act like the infamous "Ricoh Pin" when mounted to a susceptible camera. Screw the lens on and the pin retracts until it comes to the edge of the counter-sunk screw hole. Try to remove the lens and...oh, oh!

No, my S-M-C 28/3.5 is not stuck to the Singlex TLS and for that I am thankful. From the look of things, the problem is only present for those bodies whose threads are cut such that the pin "lands" at the very edge of a screw hole. I don't know if it provides a degree of insurance, but I was wondering if there is any sense in taking care to retract the pin (move A/M switch to the M setting) before removing the lens from the camera. This might be a reasonable precaution for those of us having a mix of M42 lenses and cameras. Even then, there looks to be some protrusion.


Steve

06-29-2013, 03:46 PM   #2
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The same problem exists for some Pentax equipment. Don't try mounting an SMC on an early Asahi bellows. Been there once before...
06-29-2013, 05:21 PM   #3
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QuoteOriginally posted by wirrah Quote
The same problem exists for some Pentax equipment. Don't try mounting an SMC on an early Asahi bellows. Been there once before...
I was having a few regrets about posting this notice. After all, mounting a SMC lens to a non-Pentax camera is a "one-in-a-million" case. Now I know that the call for caution is quite valid and might extend to various accessories such as bellows, extension tubes and lens/body adapters having indentation or cutouts in the mount face. At the very least, there is risk of damage to the lens mechanism.


Steve

Last edited by stevebrot; 06-29-2013 at 05:27 PM.
09-04-2013, 02:11 PM   #4
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Yep...do not mount those lenses on any Fujica ST801 or an ST901 or an ST705.
If you do, you will have a very difficult time removing it.

Bob

09-04-2013, 10:48 PM   #5
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QuoteOriginally posted by vintageslrs Quote
Yep...do not mount those lenses on any Fujica ST801 or an ST901 or an ST705.
If you do, you will have a very difficult time removing it.

Bob
Welcome to the Pentax forums and thank you for adding your comment to this thread.


Steve
09-05-2013, 10:09 AM   #6
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Thank you Steve.
09-05-2013, 12:06 PM   #7
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I haven't had problems with the Fujicas... so far
09-05-2013, 01:39 PM   #8
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Really, I am surprised....that pin can get caught in one of those tiny screw recesses and jam the lens on.....
happened to me years ago. Was a real b----- to get the lens to come off. I did eventually get it off without any damage.

Which Fujica's have you used the lenses on? I know the ST701 does not have those screws......not sure about the ST605?
But the ST801,901 and 705 for sure do.

Bob

09-05-2013, 01:46 PM   #9
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I just checked a ST605N and they do not have the screw recesses so the SMC Takumar lenses will be OK on that Fujica.
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