The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Kamlan 8mm F3.0 Fisheye and the Venus 4mm F2.8 FMFT 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. Venus 4mm F2.8 FMFT weighs 135g, 44% (110g) lighter than the Kamlan 8mm F3.0 Fisheye's weight of 245g.
Lens Mounts
The Kamlan 8mm F3.0 Fisheye has the Canon EF-M lens mount whereas the Venus 4mm F2.8 FMFT has the Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are , and for the Canon EF-M Mount and OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Kamlan 8mm F3.0 Fisheye is also available in the Sony E mount.
Focal Range
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.
On the other hand, the Venus 4mm F2.8 FMFT is a prime lens with fixed focal lenght of 4mm which has an effective (full-frame 35mm equivalent) focal range of 8mm when used on a FourThirds format camera.
