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 Canon RF-S 10-18mm F4.5-6.3 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 69mm. The Canon RF-S 10-18mm F4.5-6.3 with a length of 45mm, is 24mm shorter. On the other hand, the Canon RF-S 10-18mm F4.5-6.3 has a larger diameter of 69mm compared to the Sigma 12mm f1.4's 68mm diameter.
Below you can find a scaled side-by-side image of Sigma 12mm f1.4 and Canon RF-S 10-18mm F4.5-6.3 to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 12mm f1.4 and the Canon RF-S 10-18mm F4.5-6.3 Size and Weight 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. Canon RF-S 10-18mm F4.5-6.3 weighs 150g, 33% (75g) lighter than the Sigma 12mm f1.4's weight of 225g.
Filter Threads
The Sigma 12mm f1.4 has a filter size of 62mm whereas the Canon RF-S 10-18mm F4.5-6.3 has a 49mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Sigma 12mm f1.4:
And these are the 49mm filters that we recommend for the Canon RF-S 10-18mm F4.5-6.3:
Lens Mounts
The Sigma 12mm f1.4 has the Sony E lens mount whereas the Canon RF-S 10-18mm F4.5-6.3 has the Canon RF lens mount . Some of the latest released cameras that are compatible with these mounts are Sony ZV-E10 II , Sony A6700 and Sony FX30 for the Sony E Mount and Canon R50 V , Canon R100 and Canon R50 for the Canon RF Mount.
Fujifilm X and Canon RF 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 Canon RF-S 10-18mm F4.5-6.3 has a focal range of 10-18mm and 1.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 16-28.8mm when used on a APS-C / DX format camera.
