The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 8mm F3.5 EX DG Fisheye and the Nikon DX Fisheye-10.5mm f2.8G ED 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 8mm F3.5 EX DG Fisheye is the longer of the two lenses at 69mm. The Nikon DX Fisheye-10.5mm f2.8G ED with a length of 63mm, is 6mm shorter. Besides being longer, the Sigma 8mm F3.5 EX DG Fisheye also has a larger diameter of 74mm compared to the Nikon DX Fisheye-10.5mm f2.8G ED's 63mm 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. Nikon DX Fisheye-10.5mm f2.8G ED weighs 300g, 25% (100g) lighter than the Sigma 8mm F3.5 EX DG Fisheye's weight of 400g.
Lens Mounts
The Sigma 8mm F3.5 EX DG Fisheye has the Nikon F (FX) lens mount whereas the Nikon DX Fisheye-10.5mm f2.8G ED has the Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount and Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount.
Sigma 8mm F3.5 EX DG Fisheye is also available in Canon EF and Sigma SA mounts.
Focal Range
Sigma 8mm F3.5 EX DG Fisheye is a prime lens with fixed focal lenght of 8mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
12mm.
On the other hand, the Nikon DX Fisheye-10.5mm f2.8G ED is a prime lens with fixed focal lenght of 11mm which has an effective (full-frame 35mm equivalent) focal range of 16.5mm when used on a APS-C / DX format camera.