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09-17-2017, 01:11 PM   #1
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Identifying Pentax 67, 6x7 105 f/2.4 Lens versions

Hello all,

I'm new to the Forum.

I'm trying to identify the various versions of the 6x7 105mm f/2.4 lens. I'd like to use one on my 645N with an adapter.

I have read that there are 3 versions (ages) of this lens, with the latest being designated "SMC" vs lenses with the designation "Super-Multi-Coated," and just "Super Takumar," (the oldest).

Yet I have seen many lenses with "Super-Multi-Coated" on the foot ring being called "SMC," (KEH, eBay).

The few sample pictures I have seen of lenses with just "SMC" on the front ring are obviously the newest-looking.

I've read that only "SMC" lenses are the "non-radioactive-glass" types and do not show yellowing with age.

Can someone please explain this to me? Are lenses with the "Super-Multi-Coated" designation on the front ring also correctly also called "SMC" or do only lenses with that specific labeling deserve that name?

Do lenses designated "Super-Multi-Coated" use radioactive glass?

Thanks,

Rich

09-17-2017, 01:16 PM   #2
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QuoteOriginally posted by rich14 Quote
Hello all,

I'm new to the Forum.

I'm trying to identify the various versions of the 6x7 105mm f/2.4 lens. I'd like to use one on my 645N with an adapter.

I have read that there are 3 versions (ages) of this lens, with the latest being designated "SMC" vs lenses with the designation "Super-Multi-Coated," and just "Super Takumar," (the oldest).

Yet I have seen many lenses with "Super-Multi-Coated" on the foot ring being called "SMC," (KEH, eBay).

The few sample pictures I have seen of lenses with just "SMC" on the front ring are obviously the newest-looking.

I've read that only "SMC" lenses are the "non-radioactive-glass" types and do not show yellowing with age.

Can someone please explain this to me? Are lenses with the "Super-Multi-Coated" designation on the front ring also correctly also called "SMC" or do only lenses with that specific labeling deserve that name?

Do lenses designated "Super-Multi-Coated" use radioactive glass?

Thanks,

Rich
The specs and engraved names are listed in the tables here:

SMC Pentax 67 / S-M-C Takumar 6x7 / Super Takumar 105mm F2.4 Reviews - 67 Normal Primes - Pentax Lens Reviews & Lens Database

The latest SMC version drops the "Takumar" name but should otherwise be optically the same.

Adam
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09-17-2017, 02:21 PM   #3
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QuoteOriginally posted by Adam Quote
The specs and engraved names are listed in the tables here:

SMC Pentax 67 / S-M-C Takumar 6x7 / Super Takumar 105mm F2.4 Reviews - 67 Normal Primes - Pentax Lens Reviews & Lens Database

The latest SMC version drops the "Takumar" name but should otherwise be optically the same.
Thanks, Adam.

No information in that chart about Thorium glass. I'm guessing only the latest version is non-radioactive.

Rich
09-17-2017, 04:37 PM   #4
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QuoteOriginally posted by rich14 Quote
Thanks, Adam.

No information in that chart about Thorium glass. I'm guessing only the latest version is non-radioactive.

Rich
I'm pretty sure they did away with that when SMC came out, but let's wait for someone else to confirm.


Adam
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