Archived posting to the Leica Users Group, 2015/10/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I finally got it to open in Picture Window Pro. Thanks Jim Nichols Tullahoma, TN USA On 10/23/2015 4:40 PM, John McMaster wrote: > 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 >> >> ? > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >