The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron SP 15-30mm F2.8 Di VC USD G2 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. Tamron SP 15-30mm F2.8 Di VC USD G2 is the longer of the two lenses at 145mm. The Rokinon 8mm f3.5 Fisheye with a length of 77mm, is 68mm shorter. Besides being longer, the Tamron SP 15-30mm F2.8 Di VC USD G2 also has a larger diameter of 98mm 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, 60% (667g) lighter than the Tamron SP 15-30mm F2.8 Di VC USD G2's weight of 1110g.
Lens Mounts
Both the Tamron SP 15-30mm F2.8 Di VC USD G2 and the Rokinon 8mm f3.5 Fisheye 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.
Tamron SP 15-30mm F2.8 Di VC USD G2 is also available in the Canon EF mount.
Rokinon 8mm f3.5 Fisheye is also available in Canon EF , Four Thirds, Pentax KAF, Sony Alpha and Samsung NX mounts.
Focal Range
Tamron SP 15-30mm F2.8 Di VC USD G2 has a focal range of 15-30mm and
2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
22.5 - 45mm.
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.
