bob griffith , Feb 14, 2006; 11:45 p.m.
Until last Saturday I was the proud (or not so proud) owner of a Sigma 28 - 70 EX. I've used this lens on a D-100 off and on for about 2 years. Results with this lens were unpredictable and generally disappointing. Lens focus was soft and it seemed to have a very short depth of field (shorter than would be expected) at a wide aperture. I shoot a lot of low light work and need a lens that can perform at open apertures. I replaced the lens with the 35 - 70 2.8 Nikkor. I'll let you know how the results are after this weekend. Reviews though, all seem favorable. Another thing about this lens; I emailed Sigma a week ago regarding the report that some Sigma lens will not work properly with the D-200. This lens is on the list to be recalled. If you mail them the lens they will fix it for free. The only problem is they don't currently have the parts. I would stay away from this lens if I were you. As far as the 24 - 70 2.8 Sigma. This lens, as I'm told is the replacement for the 28 - 70 and is suppose to be much improved. This is just hear - say though.