Antti-Pekka Virjonen wrote: "What is the optical quality of this Porst lens?"
>From what I have read, these are the Pentax-compatible superfast 135s arranged in >descending order of optical quality: 1. Pentax SMC 135/1.8K (77mm filter) 2. Vivitar Series 1 135/2.3K and M42 (72mm filter) 3. Soligor 135/2 in M42 and K (72mm filter) and SigmaTel XQ 135/1.8 in T-mount, possibly M42 or K mount (77mm filter) 4. various older 135/1.8s that use an 82mm filter, including, I believe, the Porst, the Spiratone, and the non-XQ Sigma I own the Vivitar and it's everything I could want; it focuses to 0.9 or 1 meter. I've seen only one in K mount, for $165, in 1998, and was too ignorant to grab it. It is routinely available in M42 and bayonet mounts other than Pentax for about $125 to $175. The Soligor can be found in non-Pentax bayonet mounts; I've seen just two in M42 and none in K mount. The image coloration may not match that of Pentax. The Sigma XQ began as a single-coated lens. Later specimens were multicoated. [EMAIL PROTECTED] -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ . - 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 .
