Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 14-24mm F2.8 DG HSM is the longer of the two lenses at 135mm. The Sigma 12-24mm F4 DG HSM with a length of 132mm is 3mm shorter. On the other hand, the Sigma 12-24mm F4 DG HSM has a larger diameter of 101mm compared to Sigma 14-24mm F2.8 DG HSM's 96mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Sigma 14-24mm F2.8 DG HSM weighs 1150g, which means it is 1g (0%) lighter than the Sigma 12-24mm F4 DG HSM which has a weight of 1151g.
Below you can find the dimension and weight table of the 'Wideangle Zoom Lenses in Nikon F (FX) Mount for size comparison purposes.
Wideangle Zoom Lenses in Nikon F (FX) Mount for Size Comparison
Lens Mounts
Both Sigma 14-24mm F2.8 DG HSM and Sigma 12-24mm F4 DG HSM has the same Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (FX) lenses are Nikon D6, Nikon D780 and Nikon D3500.
Sigma 14-24mm F2.8 DG HSM is also available in Canon EF and Sigma SA mounts.
Sigma 12-24mm F4 DG HSM is also available in Sigma SA and Canon EF mounts.
Focal Range
Sigma 14-24mm F2.8 DG HSM has a focal range of 14-24mm and 1.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 21 - 36mm.
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 1.5x crop, it provides an 35mm (FF) equivalent of 18 - 36mm.