The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 15mm f1.4 DC C 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. Sigma 12mm f1.4 is the longer of the two lenses at 69mm. The Sigma 15mm f1.4 DC C with a length of 63mm, is 6mm shorter. On the other hand, the Sigma 15mm f1.4 DC C has a larger diameter of 69mm compared to the Sigma 12mm f1.4's 68mm 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 225g, 6% (15g) lighter than the Sigma 15mm f1.4 DC C's weight of 240g.
Filter Threads
The Sigma 15mm f1.4 DC C has a filter size of 58mm whereas the Sigma 12mm f1.4 has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 58mm filters that we recommend you to consider for the Sigma 15mm f1.4 DC C:
And these are the 62mm filters that we recommend for the Sigma 12mm f1.4:
Lens Mounts
The Sigma 15mm f1.4 DC C has the Canon RF lens mount whereas the Sigma 12mm f1.4 has the Sony E lens mount. Some of the latest released cameras that are compatible with these mounts are Canon R50 V, Canon R100 and Canon R50 for the Canon RF Mount and Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount.
Sigma 15mm f1.4 DC C is also available in the Fujifilm X and Sony E mounts.
Sigma 12mm f1.4 is also available in Fujifilm X and Canon RF mounts.
Focal Range
Sigma 15mm f1.4 DC C is a prime lens with fixed focal lenght of 15mm which has an effective (full-frame 35mm equivalent) focal range of
24mm when used on a APS-C / DX format camera.
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.
