Archived posting to the Leica Users Group, 2000/01/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi, After buying two Pentax lenses which I didn't like I started collecting the lens tests of Chasseur d'Image. And since then I have never bought a lens without consulting their tests first. Unlike other magazines not all the lenses are good. The lenses are tested with 4 diafragmas and in the middle and the border of the image. The Cosina 15mm f4.5 has only 2 stars out of 5 for performance. 4 of 5 stars for price,quality 4 of 5 stars overall The optical results are f4.5 middle average + border average - f5.6 middle good - border average f8 middle good border good f11 middle good border good At f4.5 there is a vignetage of 1 diafragma at f5.6 0.6 diafragma at f8 0.4 diafragma Under the 2 meters the finder is inaccurate. This is a completely other story then the German magazine. The Cosina 25mm f4 Performance 3 star out of 5 Price/quality 2 out of 5 Overall 1 out of 5 Here they give the (stupid) reason that you have a 24mm f2.8 for SLR for less money. The optical results are f4 middle good border good - f5.6 middle good border good f8 middle very good - border good f11 middle good + border good Vignetage f4 0.6 diafragma f5.6 0.4 diafragma The Elmarit M ASPH Performance 4 stars out of 5 price quality 1 star out of 5 Overall 3 stars out of 5 optical performance f2.8 middle very good border good f4 middle very good border very good f5.6 middle very good border excellent - f8 middle very good border excellent Vignetage f2.8 0.6 diafragma f4 0.3 diafragma The Leica lens gives better results at f2.8 then the Cosina at f8. I think I prefer the Elmarit for his quality the Cosina for his price. Regards Luc Mike Johnston <michaeljohnston@ameritech.net> on 22/01/2000 11:58:19 Please respond to leica-users@mejac.palo-alto.ca.us To: leica-users@mejac.palo-alto.ca.us cc: Subject: [Leica] Cosina lenses >>>I have been using the Cosina/Voigtlander lenses for quite a while now and I will put down my highly subjective opinions of these...<long snip> <<< This is far more valuable to me than saying "one lens is a 9.4 and one is a 9.6" as in the BAS test. A written impression based upon real use from someone who is familiar with the alternatives. As Tom suggests, this does not replace a thorough technical analysis, but it complements it meaningfully. A good user report is the first information I like to have about any lens. Thanks for your thumbnail reviews, Tom-- - --Mike