Sigma 12-24mm F4 DG HSM is an Auto Focus (AF)
Wideangle Zoom lens with 35mm FF max sensor coverage and it is designed to be used with Canon EF mount cameras.
Lens Mount
Sigma 12-24mm F4 DG HSM is compatible with cameras that have
Canon EF lens mount. Some of the latest released cameras with Canon EF lens mount are
Canon 1D X III,
Canon 6D MII and
Canon 5D MIV.
Sensor Coverage
Max sensor coverage of Sigma 12-24mm F4 DG HSM is
35mm FF.
Focal Range
Sigma 12-24mm F4 DG HSM has a focal range of 12-24mm and 2.0X zoom ratio. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 19.2 - 38.4mm.
Body Colour
Sigma 12-24mm F4 DG HSM is available in Black color.
Zoom Method
Sigma 12-24mm F4 DG HSM features
Rotary (extending) zoom method where the length of the lens changes as you zoom in or out. This makes it possible to design the lens with a smaller minimum length ( generally when it is zoomed out) compared to internal zoom lenses. The disadvantages of this design are being harder to seal against dust and moisture, weight balance shifting while zooming and zoom creep in certain lenses.
Aperture
Sigma 12-24mm F4 DG HSM is a fixed aperture lens with a constant max aperture of f4 from 12mm all the way to the 24mm .