> I have Sigma 20/1.8 DG. As do I.
> 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. This is true. I find this lens has poor edge sharpness, and I shoot this lens well stopped down, smaller than f/13 if I can help it. Kinda makes it redundant having the extra brightness - it makes more sense to have the Canon 2.8. * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
