The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 10mm F2.8 EX DC HSM Fisheye and the Rokinon 8mm f3.5 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 Rokinon 8mm f3.5 Fisheye with a length of 77mm, is 6mm shorter. Besides being longer, the Sigma 10mm F2.8 EX DC HSM Fisheye also has a larger diameter of 76mm compared to the Rokinon 8mm f3.5 Fisheye's 75mm 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. Rokinon 8mm f3.5 Fisheye weighs 443g, 6% (32g) lighter than the Sigma 10mm F2.8 EX DC HSM Fisheye's weight of 475g.
Lens Mounts
The Sigma 10mm F2.8 EX DC HSM Fisheye has the Nikon F (DX) lens mount whereas the Rokinon 8mm f3.5 Fisheye has the Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount and Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (FX) Mount.
Sigma 10mm F2.8 EX DC HSM Fisheye is also available in Canon EF and Sigma SA mounts.
Rokinon 8mm f3.5 Fisheye is also available in Canon EF , Four Thirds, Pentax KAF, Sony Alpha and Samsung NX mounts.
Focal Range
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.
On the other hand, the Rokinon 8mm f3.5 Fisheye is a prime lens with fixed focal lenght of 8mm which has an effective (full-frame 35mm equivalent) focal range of 12mm when used on a APS-C / DX format camera.