The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 14mm F1.8 GM and the Kamlan 8mm F3.0 Fisheye 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. Kamlan 8mm F3.0 Fisheye weighs 245g, 46% (215g) lighter than the Sony FE 14mm F1.8 GM's weight of 460g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Sony E Mount for size comparison purposes.
Ultra-Wideangle Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both the Sony FE 14mm F1.8 GM and the Kamlan 8mm F3.0 Fisheye has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX5, Sony A7R VI and Sony A7 V.
Kamlan 8mm F3.0 Fisheye is also available in Canon EF-M mount.
Focal Range
Sony FE 14mm F1.8 GM is a prime lens with fixed focal lenght of 14mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
21mm.
On the other hand, the Kamlan 8mm F3.0 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.
