I have done a small test of the Sigma 3.5-5.6/18-50mm DC vs. the Tokina AT-X 2.6-2.8/28-70mm (which IMHO is an excellent lens) @ 28mm f.4 and F8: http://gallery37564.fotopic.net/p17229269.html
I have enlarged the central part of the four images inside the same frame. It may be a little difficult to study the results from a small 800 KB image. Anyway, it seems that @ F4.5 the Sigma lens is not very good (unsharp). But @ F8 it's quite difficult to see any difference. I guess if used the Sigma lens @ F.5.6-F.11 there's no visible difference in most cases. Fully open it's not saticfactory at all - as expected. All images were RAW-files, converted in C1 LE using only neutral settings and no sharpening. The only editing was "Autolevels" in Photoshop CS. The camera setting were: Medium Sharpness and Minimum Contrast (which generally use). Regards Jens Bladt Arkitekt MAA http://hjem.get2net.dk/bladt -----Oprindelig meddelelse----- Fra: Jens Bladt [mailto:[EMAIL PROTECTED] Sendt: 7. juli 2005 09:41 Til: [email protected] Emne: Enabled - Sigma 18-50mm DC I just received a new toy - a Sigma 3.5-5.6/18-50mm DC. For 36 USD at a local internet auction, I believe it's a bargain. It seems to give me appr. 1/3 more FOV compared to a 24mm. I'm going to try it out during the next couple of days, when I am photographing for a corporate screensaver. I don't have huge expectations to this cheap lens. But someone once told me, he had both this and the Pentax 18-35mm f/4-5.6 FAJ AL SMC and hadn't noticed any difference in sharpness and distortion. Jens Bladt Arkitekt MAA http://hjem.get2net.dk/bladt -----Oprindelig meddelelse----- Fra: Juan Buhler [mailto:[EMAIL PROTECTED] Sendt: 6. juli 2005 23:21 Til: [email protected] Emne: Re: Have a Pentax camera, get free entry to six flags The lens I had, btw, is an Industar for the first Zenit SLR camera. This lens was basically a collapsible Industar (copy of the Elmar) that had been made shorter, to focus on a camera where the mount is farther from the film than in a Leica. j On 7/6/05, Juan Buhler <[EMAIL PROTECTED]> wrote: > Right. The focus plane is a lot closer to the back of the lens on a > Leica than on any SLR, because there's no mirror box. > > j > > On 7/6/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > Hi Shel, I'm not Juan, but the Leitz Elmar will focus only at macro distances on a 35mm SLR body. > > Paul > > (Not Juan:-) > > > > > > > Probably not with that Industar mounted on it. > > > > > > BTW, I just received an old Leitz Elmar which I'm going to try on one of > > > the K-mount bodies. Any tips or suggestions for doing that, Juan. Of > > > course, it'll also be used on the Leicas. > > > > > > Shel > > > > > > > > > > [Original Message] > > > > From: Juan Buhler > > > > > > > Hm. I wonder what they'd say if I try to enter with my black tapespecial > > > istD... > > > > Maybe they'll recognize the k mount? > > > > > > > > > > > > > -- > Juan Buhler - SIGGRAPH 2005 Sketches and Posters Chair > http://www.jbuhler.com > photoblog at http://photoblog.jbuhler.com > -- Juan Buhler - SIGGRAPH 2005 Sketches and Posters Chair http://www.jbuhler.com photoblog at http://photoblog.jbuhler.com
