More affordable Nikon AF-S compatible Sigma lenses
Sigma has responded to Nikon's move to focus on in-lens AF (AF-S) only in the new D40 and D40x consumer DSLR models by announcing HSM (hypersonic motor) AF versions of two of its more affordable DC lenses, the 18-50mm F3.5-5.6 DC HSM and the 55-200mm F4-5.6 DC HSM, for Nikon DSLRs