The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 12-24mm F4 DG HSM and the Sigma 20mm F1.8 EX DG 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 12-24mm F4 DG HSM is the longer of the two lenses at 132mm. The Sigma 20mm F1.8 EX DG RF with a length of 90mm, is 42mm shorter. Besides being longer, the Sigma 12-24mm F4 DG HSM also has a larger diameter of 101mm compared to the Sigma 20mm F1.8 EX DG RF's 89mm 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 20mm F1.8 EX DG RF weighs 520g, 54% (631g) lighter than the Sigma 12-24mm F4 DG HSM's weight of 1151g.
Lens Mounts
Both the Sigma 12-24mm F4 DG HSM and the Sigma 20mm F1.8 EX DG RF has the same Sigma SA lens mount. Some of the latest released cameras that are compatible with the Sigma SA lenses are Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill.
Sigma 12-24mm F4 DG HSM is also available in the Nikon F (FX) and Canon EF mounts.
Sigma 20mm F1.8 EX DG RF is also available in Canon EF , Nikon F (DX), Pentax KAF and Sony Alpha mounts.
Focal Range
Sigma 12-24mm F4 DG HSM has a focal range of 12-24mm and
2.0X zoom ratio .
On the other hand, the Sigma 20mm F1.8 EX DG RF is a prime lens with fixed focal lenght of 20mm.
