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 Nikon 18-35mm f3.5-4.5D IF ED for their suitability to various photography scenarios:
Size and Weight Comparison
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 18-35mm f3.5-4.5D IF ED weighs 370g, 22% (105g) 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 Nikon 18-35mm f3.5-4.5D IF ED 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 D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount.
Sigma 10mm F2.8 EX DC HSM Fisheye is also available in the Canon EF and Sigma SA 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 Nikon 18-35mm f3.5-4.5D IF ED has a focal range of 18-35mm and 1.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 27 - 52.5mm.
