The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 12mm f1.4 and the Venus Laowa 4mm F2.8 RF 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. Sigma 12mm f1.4 is the longer of the two lenses at 67mm. The Venus Laowa 4mm F2.8 RF with a length of 26mm, is 41mm shorter. Besides being longer, the Sigma 12mm f1.4 also has a larger diameter of 69mm compared to the Venus Laowa 4mm F2.8 RF's 61mm 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. Venus Laowa 4mm F2.8 RF weighs 135g, 46% (115g) lighter than the Sigma 12mm f1.4's weight of 250g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Canon RF Mount for size comparison purposes.
Ultra-Wideangle Lenses in Canon RF Mount for Size Comparison
Lens Mounts
Both the Sigma 12mm f1.4 and the Venus Laowa 4mm F2.8 RF has the same Canon RF lens mount. Some of the latest released cameras that are compatible with the Canon RF lenses are RED Komodo-X 6K, RED Komodo 6K and Canon EOS C70.
Sigma 12mm f1.4 is also available in the Sony E and Fujifilm X mounts.
Focal Range
Sigma 12mm f1.4 is a prime lens with fixed focal lenght of 12mm which has an effective (full-frame 35mm equivalent) focal range of
18mm when used on a APS-C / DX format camera.
On the other hand, the Venus Laowa 4mm F2.8 RF is a prime lens with fixed focal lenght of 4mm which has an effective (full-frame 35mm equivalent) focal range of 6mm when used on a APS-C / DX format camera.
