Bob, I did my tests with both m50 flavors I have around, matching the apertures from f11 until both were wide open. I targeted a tiled wall, with coins taped at center and near corners. Running, between rains. Will repeat one of these days with care so I can post results. Mirror used to get things properly aligned, don't believe in great errors.
Anyway, my 1.4 acted softer than the 1.7 on matching apertures. The 1.4 is older, had some fungi removed from front and rear elements but there are no stains in the coating - that may be the problem anyway. But I got the idea that the 1.7 is a little sharper - at least, mine is. There some diff in exposure - I was using manual speeds, metered from the Gossen often but not for every shot. Next time I'll get it proper. Luiz Felipe luiz.felipe at techmit.com.br http://www.techmit.com.br/luizfelipe Bob's words: It may be just me, but I'd compare the f/1.7 lens with the f/1.4 *AT* f/1.7. Reason? If they're both about the same at f/1.7, then the f/1.4 lens is just as good as the f/1.7 for all purposes you would have used the f/1.7. Bonus: a little more aperture available to control DOF with the 1.4. Bob... --------------------------------------------------------------------- I don't mind if you don't like my manners. I don't like them myself. They're pretty bad. I grieve over them on long winter evenings. -- Humphrey Bogart, "The Big Sleep" -- 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.
