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 50-100mm F1.8 A 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 50-100mm F1.8 A is the longer of the two lenses at 171mm. The Sigma 12-24mm F4 DG HSM with a length of 132mm, is 39mm shorter. On the other hand, the Sigma 12-24mm F4 DG HSM has a larger diameter of 101mm compared to the Sigma 50-100mm F1.8 A's 94mm diameter.
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Below you can find a scaled side-by-side image of Sigma 12-24mm F4 DG HSM and Sigma 50-100mm F1.8 A to get a better idea of how their sizes compare in real life.
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 12-24mm F4 DG HSM weighs 1151g, which means it is 339g (22%) lighter than the Sigma 50-100mm F1.8 A which has a weight of 1490g.
Lens Mounts
The Sigma 12-24mm F4 DG HSM has the Nikon F (FX) lens mount whereas the Sigma 50-100mm F1.8 A has the Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount and Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount.
Sigma 12-24mm F4 DG HSM is also available in Sigma SA and Canon EF mounts.
Sigma 50-100mm F1.8 A is also available in Canon EF and Sigma SA mounts.
Focal Range
Sigma 12-24mm F4 DG HSM has a focal range of 12-24mm and
2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
18 - 36mm.
On the other hand, the Sigma 50-100mm F1.8 A has a focal range of 50-100mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 75-150mm when used on a APS-C / DX format camera.