The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 12-24mm F4 DG HSM and the Sigma 15mm F2.8 EX DG Fisheye for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Sigma 12-24mm F4 DG HSM is the longer of the two lenses at 132mm. The Sigma 15mm F2.8 EX DG Fisheye with a length of 65mm, is 67mm shorter. Besides being longer, the Sigma 12-24mm F4 DG HSM also has a larger diameter of 101mm compared to the Sigma 15mm F2.8 EX DG Fisheye's 74mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Sigma 15mm F2.8 EX DG Fisheye weighs 370g, 67% (781g) lighter than the Sigma 12-24mm F4 DG HSM's weight of 1151g.
Lens Mounts
The Sigma 12-24mm F4 DG HSM has the Canon EF lens mount whereas the Sigma 15mm F2.8 EX DG Fisheye has the Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with these mounts are Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount and Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount.
Sigma 12-24mm F4 DG HSM is also available in the Sigma SA and Nikon F (FX) mounts.
Sigma 15mm F2.8 EX DG Fisheye is also available in Canon EF , Pentax KAF, Sony Alpha and Sigma SA mounts.
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 a 35mm (FF) equivalent of
19.2 - 38.4mm.
On the other hand, the Sigma 15mm F2.8 EX DG Fisheye is a prime lens with fixed focal lenght of 15mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 22.5mm.
