Archived posting to the Leica Users Group, 2002/10/15
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi Henning, I agree with your opinion on the Cosina 21. Have you used this lens B. D.? I have no visible corner distortion with mine. Regards, Greg Henning Wulff wrote: > At 11:32 AM -0400 10/14/02, B. D. Colen wrote: > >> The problem with going downmarket with a 21 is that the distortion >> can be a >> killer. I make no bones about using non-Leica equipment, but I am >> also quick >> to say that when it comes to the 21, nothing begins to touch the M 21 >> ASPH - >> including the non-asph M 21 2.8. I have a 17-35 AF D Silent Wave for the >> Nikon, as well as a 20 1.8 Sigma AF - which is cheap as dirt. Both >> produce >> sharp, contrasty images. But both produce really marked, unpleasant >> distortion at the edges of the frame - while the 21 ASPH M does not. >> >> If you are going to shoot full-frame with the 21 for anything more >> serious >> than your own entertainment, I'd say plan on trying to find a used 21 >> ASPH. >> >> B. D. > > > A 21mm lens is very important for me, and I am quite fussy about the > quality of images that these lenses can produce. > > While the 21ASPH is definitely the best of all, the 21 Cosina is a > close second among all the lenses I tried. In various comparisons over > the years, I've tried probably 25 different lenses in the 20-21mm > focal length, and to be #2 in that bunch after the ASPH isn't bad. > > Distortion is a non-issue, even for quite critical work. The > distortion levels of the 21ASPH and the Cosina 21 are as close to > identical as any practical (non-lab) test can determine. If you really > need the very lowest levels of distortion available, a 21/3.4 > SuperAngulon is best, and better than either the ASPH or Cosina. > - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html