Archived posting to the Leica Users Group, 2005/04/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]just my 2 cents - trying to reuse an old image I guess: 100 macro elmar wide open: http://www.faneuil.net/2004/slides/05.html (warning: artsy shot of crying kid) Eric ----- Original Message ----- From: "Mark Rabiner" <mark@rabinergroup.com> To: "Leica Users Group" <lug@leica-users.org> Sent: Wednesday, April 13, 2005 1:11 AM Subject: Re: [Leica] Macro Comparison Leica V. Yashica > On 4/12/05 9:33 AM, "Douglas Sharp" <douglas.sharp@gmx.de> typed: > >> Hello everyone, >> >> Only one third Leica and no Rollei at all. It may , however, be of >> interest to those of us who like optical excellence whatever the source >> may be. >> >> >> 2 full-frame shots: taken with a Macro-Elmar 4/100mm and a >> Yashica ML 2,8/55mm Macro both at f8, Canon 20D at ISO 100, tripod >> mounted, daylight. >> >> http://gallery.leica-users.org/album150/Leicaf8_full_frame >> http://gallery.leica-users.org/album150/CY_full_frame >> 2 centre crops from the same shots >> http://gallery.leica-users.org/album150/Leicaf8 >> http://gallery.leica-users.org/album150/CY_f8 >> >> I think that the resolution of the Yashica is superior but the clour >> rendition of the Leica is better (richer). >> Just to make sure that the lenses were comparable they were both >> cleaned, front and rear elements, before taking these. >> I ran the test through 5 times and got the same results for f8 and for >> other apertures, refocussing each test series to eliminate any possible >> focussing errors, and picked the best of each run. Maybe I got a duff >> Elmar, this difference in quality is surprising to say the least. >> Cheers >> Douglas >> >> BTW it's a Miners Safety Lamp >> >> > > > Boy oh Boy Doug and yous guys! > > The thin plane of focus on the macro Elmar shot is at the far right edge > of > the frame. > Its certainly to the right of the "S" of "lamps" and the "8" of the " > B/28" > I'm not even sure that true point or total plane of focus is even IN the > frame. > It just might be on the right half of the "8" itself but my hunch is its a > tad in front of it. Towards us. > In the air. > > The focus with the Yashica shot is further left on the "P" of "lamps". > The "m" is behind the plane of focus > And the "S" is in front of it. > > So if we then look at THAT area in the macro Elmar shot we think its > "sharper" then the macro Elmar. If we didn't look at the rest of the shot. > It's not where the very narrow plane of focus IS on that shot. > It's way to the left of it by the distance of 2 or 3 letters or numbers in > the shot. > > The DOF in such a shot is about an 8th of an inch as we can see. > a shot on a curve like this illustrates such a thing. > > I cant believe this crazy test has got all you guys fooled! :) > > On a test like this you'd have to bracket your focusing to make them both > match up. But it could easily be done with some bracketing. You barely > breath on the lens to change the focus by several millimeters. You just > look > at it funny and it will shift a full letter over. > :) > > > > Mark Rabiner > Photography > Portland Oregon > http://rabinergroup.com/ > > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >