The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tokina 11-16mm f2.8 DX II and the Sigma 4.5mm 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. Tokina 11-16mm f2.8 DX II is the longer of the two lenses at 89mm. The Sigma 4.5mm F2.8 EX DC HSM Fisheye with a length of 78mm, is 11mm shorter. Besides being longer, the Tokina 11-16mm f2.8 DX II also has a larger diameter of 84mm compared to the Sigma 4.5mm F2.8 EX DC HSM Fisheye's 76mm 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 4.5mm F2.8 EX DC HSM Fisheye weighs 470g, 16% (90g) lighter than the Tokina 11-16mm f2.8 DX II's weight of 560g.
Lens Mounts
Both the Tokina 11-16mm f2.8 DX II and the Sigma 4.5mm 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 11-16mm f2.8 DX II is also available in the Canon EF and Sony Alpha mounts.
Sigma 4.5mm F2.8 EX DC HSM Fisheye is also available in Canon EF and Sigma SA mounts.
Focal Range
Tokina 11-16mm f2.8 DX II has a focal range of 11-16mm and
1.5X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
16.5-24mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 4.5mm F2.8 EX DC HSM Fisheye is a prime lens with fixed focal lenght of 5mm which has an effective (full-frame 35mm equivalent) focal range of 7.5mm when used on a APS-C / DX format camera.
