On Feb 7, 2007, at 1:30 PM, Igor Roshchin wrote: > I haven't owned either of the two, but the fact that the FA77 is > faster > then the DA70 has been a big argument for me. > One of the reasons I am considering buying an FA77 or one of the 85's > is that in addition to being a nice portrait lens on digital, > it can be used as a FAST short-tele. > > DA70, on the other hand, has the advantage of quick-shift focus. ...
The difference in maximum aperture between the two lenses is about two-thirds of a stop. At maximum aperture, and including the focal length difference, that amounts to a total of 2.5 inches difference in acceptably sharp focus zone wide open at 10 foot distance. Quickshift is worth much more to me than those small differences. It's a judgement call, certainly, but I am generally exposing at f/4 at least anyway, even for portraits, to obtain enough DoF. :-) Godfrey -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
