The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 16mm f2.0 and the Nikon Fisheye-16mm f2.8D for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Samyang 16mm f2.0 is the longer of the two lenses at 89mm. The Nikon Fisheye-16mm f2.8D with a length of 57mm, is 32mm shorter. Besides being longer, the Samyang 16mm f2.0 also has a larger diameter of 83mm compared to the Nikon Fisheye-16mm f2.8D's 63mm diameter.
The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Nikon Fisheye-16mm f2.8D weighs 290g, 50% (293g) lighter than the Samyang 16mm f2.0's weight of 583g.
Lens Mounts
The Samyang 16mm f2.0 has the Nikon F (DX) lens mount whereas the Nikon Fisheye-16mm f2.8D 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.
Samyang 16mm f2.0 is also available in Canon EF , Canon EF-M, Fujifilm X, Four Thirds, Micro Four Thirds, Pentax KAF, Sony Alpha, Sony E and Samsung NX mounts.
Focal Range
Both lenses have the same focal range of 16mm but while Samyang 16mm f2.0 has the fastest aperture of F2.0, the Nikon Fisheye-16mm f2.8D's widest aperture value is F2.8.