The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 15mm f1.4 DC C and the Sigma 15mm F2.8 EX DG Fisheye for their suitability to various photography scenarios:
Size and Weight Comparison
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 f1.4 DC C weighs 225g, which means it is 145g (39%) lighter than the Sigma 15mm F2.8 EX DG Fisheye which has a weight of 370g.
Lens Mounts
The Sigma 15mm f1.4 DC C has the Fujifilm X lens mount whereas the Sigma 15mm F2.8 EX DG Fisheye has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount and Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount.
Sigma 15mm f1.4 DC C is also available in the Canon RF and Sony E mounts.
Sigma 15mm F2.8 EX DG Fisheye is also available in Canon EF , Nikon F (FX), Pentax KAF and Sigma SA mounts.
Focal Range
Both lenses have the same focal range of
15mm but while Sigma 15mm f1.4 DC C has the fastest aperture of
F1.4, the Sigma 15mm F2.8 EX DG Fisheye's widest aperture value is
F2.8.
