The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 4.5mm F2.8 EX DC HSM Fisheye and the Nikon 12-24mm f4G ED-IF 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. Nikon 12-24mm f4G ED-IF is the longer of the two lenses at 90mm. The Sigma 4.5mm F2.8 EX DC HSM Fisheye with a length of 78mm, is 12mm shorter. Besides being longer, the Nikon 12-24mm f4G ED-IF also has a larger diameter of 83mm 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, which means it is 15g (3%) lighter than the Nikon 12-24mm f4G ED-IF which has a weight of 485g.
Lens Mounts
Both the Sigma 4.5mm F2.8 EX DC HSM Fisheye and the Nikon 12-24mm f4G ED-IF 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.
Sigma 4.5mm F2.8 EX DC HSM Fisheye is also available in the Canon EF and Sigma SA mounts.
Focal Range
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.
On the other hand, the Nikon 12-24mm f4G ED-IF has a focal range of 12-24mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 18-36mm when used on a APS-C / DX format camera.
