Just a follow-up to my own question. I've forgotten that the S-M-C version also added the aperture-closing mechanism (such as is used on the Spotmatic F). This alone could count for the few grams of difference between the Super Tak and the S-M-C Tak. The K20 f4 is clearly a different (and superior) optical design, but I'm convinced now that the Taks are the same design and other than the coatings and aperture-closing are the same beast.
-D On Thu, Aug 9, 2012 at 12:23 PM, Darren Addy <[email protected]> wrote: > I've recently come into possession of a nice Super-Multi-Coated > Takumar 20mm f4.5. While googling around I found one source that > indicated that the S-M-C version was an improved optical design > (specifically mentioning an improvement over the earlier Super > Takumar's distortion. (Now I'm having trouble locating that page > again). The Ultimate Screwmount Guide seems to think that the Super > Takumar and the S-M-C versions are the same and only differ in > coatings. Another source ( http://www.aohc.it/tak02e.htm ) indicates a > 5 gram weight difference between the two versions (which may or may > not say anything about the optical design). > > Does anyone have any other sources of information that might shed > light on whether they differ only in coatings or if it is more than > that? Thanks in advance. > > > > -- > "The key to seeing the world's soul, and in the process wakening one's > own, is to get over the confusion > by which we think that fact is real and imagination an illusion. It is > the other way around." > > -Thomas Moore, "Original Self" -- "The key to seeing the world's soul, and in the process wakening one's own, is to get over the confusion by which we think that fact is real and imagination an illusion. It is the other way around." -Thomas Moore, "Original Self" -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
