Sigma 120-300mm F2.8 EX DG HSM is an Auto Focus (AF) Telephoto Zoom
lens with 35mm FF max sensor coverage and it is designed to be used with Nikon F (FX) mount cameras.
Lenses in Nikon F (FX) Mount with Same Focal and Aperture Range
Sigma 120-300mm F2.8 EX DG HSM is compatible with cameras that have Nikon F (FX)
lens mount. Some of the latest released cameras with Nikon F (FX) lens mount are
Max sensor coverage of Sigma 120-300mm F2.8 EX DG HSM is 35mm FF
Sigma 120-300mm F2.8 EX DG HSM has a focal range of 120-300mm and 2.5X zoom ratio. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 180 - 450mm.
Optical Image Stabilization
Sigma 120-300mm F2.8 EX DG HSM doesn't have an optical image stabilization system so the only option to stabilize the image taken with this lens is to mount on a camera body with IBIS (sensor based In-body image stabilization).
Sigma 120-300mm F2.8 EX DG HSM features Rotary (internal)
zoom method where the length of the lens doesn't change while you are zooming in or out. Even though this design has a size disadvantage in general compare to extending designs, it has the benefits of better sealing against dust and moisture, no zoom creep and no weight balance shift while zooming.
Maximum Magnification Ratio
Sigma 120-300mm F2.8 EX DG HSM has a Max Magnification Ratio of 0.12x
and has a minimum focusing distance of 2.5m
Sigma 120-300mm F2.8 EX DG HSM is a fixed aperture lens with a constant max aperture of f2.8 from 120mm all the way to the 300mm .
Sigma 120-300mm F2.8 EX DG HSM's optical formula consists of 18 elements in 16 groups.