Sigma HSM OR DC?

[Paul Deavall]

Hi guys do we know what HSM & DC means with sigma lenses. I'm looking at the 17-70 Nikon fit f2.8

 

[k4stn]

HSM----Hyper Sonic Motor
DC ----For APS-C (crop sensors)cameras

 

[grotty]

HSM----Hyper Sonic Motor
DC ----For APS-C (crop sensors)cameras

This.

Also, DG is suitable for full frame as well as crop.