Dg Aspherical Hsm

Some articles on hsm, dg aspherical hsm:

Sigma Corporation - Lenses - Zoom Lenses - Wide-angle Zooms
8–16mm f/4-5.6 DC HSM 10–20mm f/4-5.6 EX DC HSM 10–20mm f/3.5 EX DC HSM 12–24mm f/4.5–5.6 EX DG Aspherical HSM 12–24mm f/4.5-5.6 DG Aspherical HSM II 15–30mm f/3.5 ...