Sigma has today announced a new AF 20-40mm F2.8 EX DG lens. Again this lens appears to be aimed at owners of digital SLR's because it offers a relatively useable bottom end (wide end) to a normal mid point in a compact lens construction. For example, this lens on a Canon EOS-D30 would provide an equiv. range of 32-64 mm, on a Nikon D1x it provide an equiv. range of 30-60 mm. The lens has access at the back for filters.