The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 24-50mm F2.8 G 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. Sony FE 24-50mm F2.8 G is the longer of the two lenses at 92mm. The Sigma 15mm F2.8 EX DG Fisheye with a length of 65mm, is 27mm shorter. Besides being longer, the Sony FE 24-50mm F2.8 G also has a larger diameter of 75mm 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, 15% (70g) lighter than the Sony FE 24-50mm F2.8 G's weight of 440g.
Lens Mounts
The Sony FE 24-50mm F2.8 G has the Sony E lens mount whereas the Sigma 15mm F2.8 EX DG Fisheye has the Sigma SA lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill for the Sigma SA Mount.
Sigma 15mm F2.8 EX DG Fisheye is also available in Canon EF , Nikon F (FX), Pentax KAF and Sony Alpha mounts.
Focal Range
Sony FE 24-50mm F2.8 G has a focal range of 24-50mm and
2.1X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
36 - 75mm.
On the other hand, the Sigma 15mm F2.8 EX DG Fisheye is a prime lens with fixed focal lenght of 15mm.
