Re: K135/2.5 vs FA 135/2.8 (was Re: Vivitar 135/2.3 lens ?)
>> The K 135/2.5 is also one of only three Pentax lenses that have >> the same optical design (according to lens element diagrams) - >> the K 135/2.5, the K 200/2.5, and the A* 200/2.8. >> >> (Note that it's not just the "6 elements in 6 groups" >> configuration that they share - it's also that their optical >> diagrams are virtually identical.) (The K 200/4, as a >> contrasting example, also has a "6/6" formula, but has a >> different optical diagram.) > I just visited Boz's site and it mentions a 5-5 design for the K > 200/4 (which is also a nice lens I'd say), so I suspect that Fred > is reffering to the A 200/4 (which is one of the lenses that I > don't hear much about, it's not very popular or rare or > something). Oops - thanks for the correction, Valentin. Yes, it's the A 200/4 and not the K 200/4. Sometimes I don't let the facts stand in the way of a good exposition - . Fred
Re: K135/2.5 vs FA 135/2.8 (was Re: Vivitar 135/2.3 lens ?)
I just visited Boz's site and it mentions a 5-5 design for the K 200/4 (which is also a nice lens I'd say), so I suspect that Fred is reffering to the A 200/4 (which is one of the lenses that I don't hear much about, it's not very popular or rare or something). Fred wrote: The K 135/2.5 is also one of only three Pentax lenses that have the same optical design (according to lens element diagrams) - the K 135/2.5, the K 200/2.5, and the A* 200/2.8. (Note that it's not just the "6 elements in 6 groups" configuration that they share - it's also that their optical diagrams are virtually identical.) (The K 200/4, as a contrasting example, also has a "6/6" formula, but has a different optical diagram.)
K135/2.5 vs FA 135/2.8 (was Re: Vivitar 135/2.3 lens ?)
This gives me the idea to ask - did anyone compare the "character" of the two Pentax lenses ? And give us a couple of hints on the optics of these two lenses, from a comparative pov ? cheers, caveman zcaballero wrote: Hello, I use once and also the Pentax 135mm 2.5 lens to photo same subject on same film by changing lens on camera. The Vivitar is OK, but the colors produced by Pentax lens were more saturate less washed out. Cannot comment on the sharpness because didn't check that. Also, the Pentax handled for me better - the feeling of focus was more smooth. Z Hello, has anyone here used this ? (Vivitar series 1 135/2.3 close focusing) ? What is your opinion on this one ? -- Email.it, the professional e-mail, gratis per te: http://www.email.it/f Sponsor: Comunica con il mondo in sicurezza e rapidità ordina subito la tua casella da 15 MB o 50 MB di spazio Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=1044&d=30-5
