At 09:02 AM 01/13/2002, you wrote: >I have been looking (kind of seriously) at Sigma's new 20mm f/1.8 EX. This >lens, like some of their other newer ones has a "DG" designation. In >checking the Sigma lens site, I can't seem to find what the DG stands for. >Does anyone know?
From their FAQ: Q. Does Sigma make lenses for digital cameras. A. Sigma presently offers a number of lenses designed specifically for digital SLR cameras, which can also be used with 35mm SLRs. They are mostly wideangle and widezoom type lenses with large apertures (e.g. 20mm f/1.8, 24mm f/1.8, 28mm f/1.8, 24-70mm f/2.8, 15-30mm f/3.5-4.5), and feature superior light distribution, so that there is minimal light fall-off or vignetting, even when used at maximum aperture. These lenses are designated DG type, and are part of Sigma's EX series of lenses. Remember that the digital imaging device is generally much smaller than a 35mm negative, so the lens will have a longer "effective" focal length. The conversion factor is generally about 1.5X, so a 14mm lens effectively becomes about 21mm when used on these digital cameras. As a result, there are few choices available for wideangle lenses, or even fast "normal" lenses, for these digital cameras. These new DG lenses help fill this void. -- regards, Henry Posner Director of Sales and Training B&H Photo-Video, and Pro-Audio Inc. http://www.bhphotovideo.com * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
