The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tokina 10-17mm f3.5-4.5 Fisheye and the Sigma 10mm F2.8 EX DC HSM 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 10mm F2.8 EX DC HSM Fisheye is the longer of the two lenses at 83mm. The Tokina 10-17mm f3.5-4.5 Fisheye with a length of 71mm, is 12mm shorter. Besides being longer, the Sigma 10mm F2.8 EX DC HSM Fisheye also has a larger diameter of 76mm compared to the Tokina 10-17mm f3.5-4.5 Fisheye's 70mm 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. Tokina 10-17mm f3.5-4.5 Fisheye weighs 350g, which means it is 125g (26%) lighter than the Sigma 10mm F2.8 EX DC HSM Fisheye which has a weight of 475g.
Lens Mounts
Both the Tokina 10-17mm f3.5-4.5 Fisheye and the Sigma 10mm F2.8 EX DC HSM Fisheye has the same Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (DX) lenses are Nikon D3500, Nikon D7500 and Nikon D5600.
Tokina 10-17mm f3.5-4.5 Fisheye is also available in the Canon EF mount.
Sigma 10mm F2.8 EX DC HSM Fisheye is also available in Canon EF and Sigma SA mounts.
Focal Range
Tokina 10-17mm f3.5-4.5 Fisheye has a focal range of 10-17mm and
1.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
15-25.5mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 10mm F2.8 EX DC HSM Fisheye is a prime lens with fixed focal lenght of 10mm which has an effective (full-frame 35mm equivalent) focal range of 15mm when used on a APS-C / DX format camera.
