Archived posting to the Leica Users Group, 2013/05/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I think with some of the Leica super premium glass what it might get at wide open is what the previous lens got a few stops less so there is no need to stop down to get more resolution or contrast as you are getting plenty. And in itself stopping down does not make much of a difference on those parameters. You'd only stop down if you wanted a bit more depth sharp; a tad more leeway or breathing room. I know that much of long and very long lens shooting is done wide open by people who know what they are doing and on a regular basis with no stopping down at all as a matter of course. And a faster shutter speed is with long glass sorely needed. And of course the isolation of subject is more of an obvious choice with long glass. You're going to get it anyway. On 5/19/13 9:05 PM, "Doug Herr" <wildlightphoto at earthlink.net> wrote: > Mark Rabiner wrote: > >> If you've looked at those lens test charts they used to always had in Pop >> and Modern photography monthly for decades we all did a lens always get a >> bit better contrast and resolution stopped down two or three. Its just the >> nature of optics. > > It's how the lenses were designed. They don't have to be designed that > way. > Use an R APO-Telyt at full aperture and everything you "know" about optics > will be obsolete. I use the diaphragm for DOF control and exposure > control. > Stopping down one or two stops for optimum performance does not apply to > the > best lenses. > > Doug Herr > Birdman of Sacramento > http://www.wildlightphoto.com > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information -- Mark William Rabiner Photography http://gallery.leica-users.org/v/lugalrabs/