i thought dc was for digital crop frame cameras. and dg was for full frame digital and 35mm film. although the older(film) ones still work on crop sensor cameras i think.
http://www.sigma-imaging-uk.com/support/abbriviations.htm
sigma only list the 70-200 ex dg at the mo, as far as i can see.
hi,
the one im looking at is the oldest version of the lens, so although it doesn't have DG it will still work?