Depth of field has nothing to do with the characteristics of a particular lens. It is merely a function of aperture and Focal length. The answer is simple. The 77 limited will have a greater depth of field at any focusing distance, with a commensurate wider field of view at that same distance due to it's shorter focal length and smaller maximum aperture. For example the 77/f1.8 ltd. would have a depth of field at one meter of .993 M to 1.07 M or a total DOF of .014 M or a little over 1/2 inch. The 75/f1.4 would have a depth of field at one meter of .996 M to 1.004 M or a total DOF of .009 M or a little over 1/3 inch. At 08:04 PM 5/29/2001 -0400, you wrote: >Hey all, > I have a technical question regarding these two lenses. I'm sure someone >has experienced both. > I would like to know which of these has the longer DOF wide open. I'm >interested in something a little longer for available light night shooting. >Basically from the comments I've read, the FA85 F1.4 has a rather short DOF >optimizied for portraiture. I haven't seen to many comments on the 77LTD's >DOF length wide open. Any help in this regard is greatly appreciated. > >Thanks, >Douglas E Harmon >[EMAIL PROTECTED] >http://personal.mia.bellsouth.net/~genius91/ > > >- >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 . - 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 .
