Paul wrote: >Hmmm, that makes me wonder if the SMC Tak >85/1.8 and the K 85/1.8 are, in fact, optically >identical. Perhaps there's must more of a front >element retainer ring on the earlier lens.
I think they're the same. Pentax standardized lens accessory threads to 49mm, 58mm, etc. in the later screwmount years. The SMC Tak 85/1.8 may have required more than 49mm, hence the 58mm filter size. When the K mount came out, the body mount was of a larger diameter than the screwmount lenses, and a correspondingly larger 52mm filter thread was adopted as minimum size. This apparently was large enough for the K 85/1.8. The 49mm filter was adopted once again (alongside 52mm where needed) with the introduction of the M series lenses. Mark Rofini - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
