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Forum: Pentax SLR Lens Discussion
12-17-2010, 02:07 AM
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I've noticed that too about the M135/3.5, it looks more compact but it's a 5 element design compared to the S-M-C Tak which is a 4 element design. The SMC-K version looks pretty much the same as the S-M-C Tak except for some cosmetic issues.
I now have both S-M-C Tak 55/1.8 and M50/1.7 but so far cannot confirm any significant difference. The guy that sold me the M said that it's better coated than the Tak and I can somewhat confirm this on a more empirical level, it looks like the front element reflects lesser light than my Tak.
I cannot say anything about the S-M-C Tak 29/3.5 except that it's sharp, however I've heard someone saying that SMCK 29/3.5 was actually an upgrade of the original S-M-C Tak and gets generally better reviews compared to both Tak and M versions.
I just remembered very important aspect about the Tak coating process, that it's radioactive. Pentax used thoriated lenses for this series. Does anyone know if this has been kept throughout the later SMCK and M series?
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Forum: Pentax SLR Lens Discussion
12-16-2010, 01:42 PM
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Just to give some short examples to complete the picture. I've heard that S-M-C Tak 135/3.5 is basically identical to SMC Pentax-M 135/3.5 however the latter is more compact than the former. My second example would be S-M-C Tak 55/1.8 against SMC Pentax-M 50/1.7, I've heard that M's are actually sharper than the Tak's and have more layers. Third and last, S-M-C Tak 28/3.5 against SMC Pentax-M 28/3.5. The word is that M's are sharper at this aperture but don't know for sure, also it looks more compact that the Tak.
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Forum: Pentax SLR Lens Discussion
12-16-2010, 12:09 PM
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Thanks Postumus, I agree with your approach and appreciate your feedback. However both my Takumars and the M's I was referring to, are Super Multi Coated. My question was more related on how exactly did the coating improve (I it did at all) from one to the other. I heard something about the number of layers being higher on M's compared to Tak's. Also, is it true that M's are better performers in terms of image quality?
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Forum: Pentax SLR Lens Discussion
12-16-2010, 05:58 AM
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Hi,
I have about 3 Super-Multi-Coated Takumar lenses (55/1.8, 29/3.5 and 135/3.5) and recently got a SMC Pentax-M 50 1.7 which I like a lot. The coating looks a bit different on the M compared to the Tak's and I was wondering if there is a significant difference in optics quality between these two categories? . Thanks :)
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