The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony 16mm F2.8 Fisheye 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 16mm F2.8 Fisheye is the longer of the two lenses at 67mm. The Sigma 15mm F2.8 EX DG Fisheye with a length of 65mm, is 2mm shorter. Besides being longer, the Sony 16mm F2.8 Fisheye 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, 7% (30g) lighter than the Sony 16mm F2.8 Fisheye's weight of 400g.
Lens Mounts
The Sony 16mm F2.8 Fisheye has the Sony Alpha lens mount whereas the Sigma 15mm F2.8 EX DG Fisheye has the Pentax KAF lens mount. Some of the latest released cameras that are compatible with these mounts are Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount and Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount.
Sigma 15mm F2.8 EX DG Fisheye is also available in Canon EF , Nikon F (FX), Sony Alpha and Sigma SA mounts.
Focal Range
Sony 16mm F2.8 Fisheye is a prime lens with fixed focal lenght of 16mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
24mm.
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.
