Sigma 18-250mm f3.5-6.3 DC MACRO HSM for Pentax Digital SLR Cameras 18-250mm focal length, only compatible with APS-C DSLRs 27-375mm equivalent focal length on APS-C cameras, 28.8-400mm equivalent focal length on Canon APS-C cameras Micromotor-type AF motor with full-time manual focusing Image stabilization, Up to 4 stops claimed 62mm filters Available in Canon EF, Nikon F (DX), Pentax KAF3, Sony Alpha, Sigma SA mounts