Frantisek Vlcek <[EMAIL PROTECTED]> wrote: > Hi, Hi Frantisek,
> anybody has this smallest 20mm lens I have ever seen? (...) > I read mixed reviews about the M 20/4 on Stan's page and others, > some say it's got horrible double distortion - that isn't that of a > concern for landscapes and people, but I would like it to be > decently sharp at 5.6 and very sharp at 8, is that so? How about > compared to other 20mm lenses, the Mir and the Zeiss Jena? The M 20/4 is my only original Pentax 20mm (I do have the Mir and I had for a while the 20/2.5). I can say that it is reasonably sharp starting from f/5.6, although the borders become sharp only from f/8. The big problem with this lens is the huge vignetting wide open. It disappears when stopped down (from f/8, more or less). The great advantage over the other lenses you mention is its size. It can't be beat in this regard. I think it is the shorter M lens with the exception of the 40/2.8, which says a lot. It is of course less prone to flare than the Mir (I don't know about the Flektogon). I have never experienced the double distorsion you mention. I never made a real test to verify its distorsion (or lack of), but I have always found the lens well corrected (I don't actually shot buildings with it, but I can test it if you need). > I usually enlarge 135 format up to 30x40cm (and would even bigger if > I had big enough trays and easel), of course I can (and have) > medium format but lots of times I want to carry only small stuff. You won't be disappointed if you use it stopped down enough. The center is quite sharp even at f/4, but I don't know if a picture taken at that aperture can be enlarged with satisfaction up to 30x40. > Thanks! You are welcome! Gianfranco ===== Yahoo! Tax Center - online filing with TurboTax http://taxes.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
