The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 11-20mm F2.8 X and the Rokinon 8mm f2.8 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 11-20mm F2.8 X is the longer of the two lenses at 86mm. The Rokinon 8mm f2.8 Fisheye with a length of 77mm, is 9mm shorter. On the other hand, the Rokinon 8mm f2.8 Fisheye has a larger diameter of 75mm compared to the Tamron 11-20mm F2.8 X's 73mm 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. Tamron 11-20mm F2.8 X weighs 335g, which means it is 108g (24%) lighter than the Rokinon 8mm f2.8 Fisheye which has a weight of 443g.
Lens Mounts
Both the Tamron 11-20mm F2.8 X and the Rokinon 8mm f2.8 Fisheye has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5.
Focal Range
Tamron 11-20mm F2.8 X has a focal range of 11-20mm and
1.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
16.5-30mm when used on a APS-C / DX format camera.
On the other hand, the Rokinon 8mm f2.8 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.
