The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF 7-14mm F2.8-3.5 and the Sigma 12mm f1.4 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. Canon RF 7-14mm F2.8-3.5 is the longer of the two lenses at 109mm. The Sigma 12mm f1.4 with a length of 67mm, is 42mm shorter. Besides being longer, the Canon RF 7-14mm F2.8-3.5 also has a larger diameter of 77mm compared to the Sigma 12mm f1.4's 69mm 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. Sigma 12mm f1.4 weighs 250g, 47% (226g) lighter than the Canon RF 7-14mm F2.8-3.5's weight of 476g.
Lens Mounts
Both the Canon RF 7-14mm F2.8-3.5 and the Sigma 12mm f1.4 has the same Canon RF lens mount. Some of the latest released cameras that are compatible with the Canon RF lenses are Canon R6 V, Canon R6 III and Canon C50.
Sigma 12mm f1.4 is also available in Sony E and Fujifilm X mounts.
Focal Range
Canon RF 7-14mm F2.8-3.5 has a focal range of 7-14mm and
2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
11.2 - 22.4mm.
On the other hand, the 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.
