I am no expert on macro, but afaik, fast lenses aren't preferred for extreme close-up. For 50mm, f1.7 or f2 is preferred.
regards, Alan Chan >I am looking at permanently attaching a 50 mm lens reverse mounted on >my bellows - I usually use my FA50f1.4, but I'm starting to get annoyed >with taking it apart and putting it back together again. The question >I need answered is, as I'm going to dedicate a lens to the bellows, >which one would be best for my needs? > >I generally shoot with the lens stopped down to f16 or f22 to get the >greatest depth of field. My subjects are 3 dimensional, so a flat >field of focus is not 100% necessary. My subjects also tend to hide >from bright lights, so I can't use extra light to help me focus, and at >full extension of the bellows and a 2 times converter between the >camera and bellows (7 times magnification to the film), any extra light >is a bonus. > >I'll probably end up with a K or M f1.4 or a K f1.2, but the closest I >have come to an f1.2 is picking one up at a swap meet, so I have no >idea of it's optical performance compared with an f1.4 (particularly >reverse mounted on bellows for macro use). > >So my question to all you knowledgable people out there is: is a 50 mm >f1.2 as sharp as an f1.4 when stopped down between f11 and f22, and is >there anything you know about these lenses that I should know before I >go out and try to buy one? > >Any and all help is greatly appreciated. _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.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 .
