The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 15mm F2.8 EX DG Fisheye and the Tokina 17-35mm f4 Pro FX 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. Tokina 17-35mm f4 Pro FX is the longer of the two lenses at 94mm. The Sigma 15mm F2.8 EX DG Fisheye with a length of 65mm, is 29mm shorter. Besides being longer, the Tokina 17-35mm f4 Pro FX also has a larger diameter of 89mm 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, which means it is 230g (38%) lighter than the Tokina 17-35mm f4 Pro FX which has a weight of 600g.
Lens Mounts
Both the Sigma 15mm F2.8 EX DG Fisheye and the Tokina 17-35mm f4 Pro FX has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Sigma 15mm F2.8 EX DG Fisheye is also available in Nikon F (FX) , Pentax KAF, Sony Alpha and Sigma SA mounts.
Tokina 17-35mm f4 Pro FX is also available in Nikon F (FX) mount.
Focal Range
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 1.6x crop, it provides a 35mm (FF) equivalent of
24mm.
On the other hand, the Tokina 17-35mm f4 Pro FX has a focal range of 17-35mm and 2.1X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 27.2 - 56mm.