Archived posting to the Leica Users Group, 2015/10/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Paul, I can't get the link to work. Jim Nichols Tullahoma, TN USA On 10/23/2015 4:23 PM, Paul Roark wrote: > Frank Dernie wrote: > >> ?... >> much easier to design an exceptional lens if size is not a constraint. >> ?... >> > ?Yes, everything is a whole set of compromises. I assume Leica and Zeiss > will both continue to make optics that also cater to those who value > compactness. The M line is Leica's current showcase of what it can do. It > may be that the Loxia line for the Sony is representative of what Zeiss can > do for that platform. > > Since wide angle optics are the main area of my concern regarding the Sony > line, I was curious just how much of a penalty that platform will pay. To > show this, I made a Tiff file with a cutout of the Leica v. Zeiss Loxia > 21mm f/2.8 entries into this competition shown on different layers. The > images are adjusted to equalize size and distance from the sensor/film. > Some might find looking at the two similar optics interesting. Download > the Tiff from > http://www.paulroark.com/Loxia-v-Leica-21-f28.tif > > As to relative sharpness, all we have are MTF curves that are not > necessarily comparable. If they are to be believed, the Zeiss wins by a > hair. My experience is that Leica is more conservative in these, and in > the real world Leica might well win by a hair. The main and more > objective measure of performance that could be important is that, > consistent with the performances we see in other wide angle lenses, the > more retrofocus optic has less vignetting. Zeiss is claiming light falloff > at f/2.8 that is equal to the Leica at f/8. > > Paul > www.PaulRoark.com > > ? > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >