Archived posting to the Leica Users Group, 2015/10/23[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]
It seems to be an odd TIF, opens in PhotoShop but not Mac preview john -----Original Message----- 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 > > ?