Hi I have Sigma 20/1.8 DG.
With film it vignettes a lot at f1.8 and also has poor corner/edge sharpness. If I use f5.6 then it seems to be fine. Center sharpness is quite ok even full open but unless necessary I will use it at max f2.8 although even then it vignettes some. I believe the vignetting wouldn't be better even if Canon made a similar lens. I haven't used it very much but the few slides that I have framed and viewed with slide projector look fine at f2.8 but the subject was such that the edges were dark and extremely light so can't say how visible the vignetting is in real life. I have noticed that projected slides look better than they do on a light table, in any case. This lens among other DG lenses and 24/1.4 and 28/1.8 from Canon was reviewed in a Finnish magazine and as I recall it was not so much different from the others. Canons had better flare handling but Sigmas focused closer. This 20/1.8 was the shortest lens in the test so that might be partial reason for the slightly higher flare of it. I'm not sure if I had had bought this lens for full price (around 670E (e=Euro)) but for half that price of a mint used it was good enough deal. Hoya Pro filter was cheap, too, on it. I the Sigma instead of used Canon 17-35 which I may get some day later (or perhaps the 16-35). Vesa _________________________________________________________________ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
