B003HC8VB8 Sigma 70-200mm f/2.8 APO EX DG HSM OS FLD Large Aperture Telephoto Zoom Lens for Sony Digital DSLR Camera

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70-200mm focal length
105-300mm equivalent focal length on APS-C cameras, 112-320mm equivalent focal length on Canon APS-C cameras
F2.8 constant maximum aperture; F22 minimum
Ring-type ultrasonic-type AF motor with full-time manual focusing
Image stabilization, 4 stops claimed. Dual mode, normal and panning
77mm filters
1.40m/55.12″ minimum focus
Available in Canon EF, Nikon F (FX), Pentax KAF3, Sony Alpha, Sigma SA mounts