Timothy Sherburne wrote: >Thanks to Peter, Ayash, Kevin and Fred for their responses, which all came >to basically the same conclusion: the A50/1.4 simply does not have a flat >enough field of focus to work well for macro photography; the curvature of >the lens elements are becoming more apparent as the depth of field >decreases. > >Okay, with that said, I believe the solution was to use a slower lens or >stop down. Is it accurate to conclude that the slower the lens, the flatter >focusing field? The 50/4 is flatter than the 50/2 is flatter than the >50/1.7, et cetera?
I've been told by knowledgable folks on this list that the 50/1.7 is a bit better in this regard but flatness of field isn't *related* to max aperture so the 50/2.0 isn't necessarily better. Of course, an actual macro lens will be best of all, whether it's a 50/4.0 or 50/2.8 or whatever. -- Mark Roberts www.robertstech.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 .
