Archived posting to the Leica Users Group, 2003/02/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Dead wrong. A fast wideangle at infinity, like a 21/2.8. That is where if you have any error in back focus, you will focus in front of or behind infinity. The closer the lens is focused, the more depth of focus due to increased magnification. Wideangles gain depth of focus to a much lesser degree as you focus close. There is a very detailed description of this on my web site. On Thursday, February 13, 2003, at 10:24 PM, Don Dory wrote: > John, I think that the more critical test would be a fast wide angle > at near > minimum focus. Why, you ask? While a wide angle has more DOF the > distance > from the rear element to the film plane is extremely critical, more so > than > a telephoto: therefore if the film plane is off the lens won't be > sharp. I > should know, I have some issues with a 35 Biogon on a Contax. > > Don > dorysrus@mindspring.com > > -- > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html > > ____________ Dante Stella http://www.dantestella.com - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html