The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 15mm F2.8 EX DG Fisheye and the Nikon 18-35mm f3.5-4.5D IF 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. Nikon 18-35mm f3.5-4.5D IF ED is the longer of the two lenses at 83mm. The Sigma 15mm F2.8 EX DG Fisheye with a length of 65mm, is 18mm shorter. Besides being longer, the Nikon 18-35mm f3.5-4.5D IF ED also has a larger diameter of 83mm compared to the Sigma 15mm F2.8 EX DG Fisheye's 74mm 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.
Lens Mounts
Both the Sigma 15mm F2.8 EX DG Fisheye and the Nikon 18-35mm f3.5-4.5D IF ED has the same Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (FX) lenses are Nikon D6, Nikon D780 and Nikon D3500.
Sigma 15mm F2.8 EX DG Fisheye is also available in the Canon EF , Pentax KAF, Sony Alpha and Sigma SA mounts.
Focal Range
Sigma 15mm F2.8 EX DG Fisheye is a prime lens with fixed focal lenght of 15mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
22.5mm.
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.
