>> 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 - <har>. Fred
