The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 24-70mm F2.8 II and the Samyang 21mm F1.4 ED AS UMC CS 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 24-70mm F2.8 II is the longer of the two lenses at 122mm. The Samyang 21mm F1.4 ED AS UMC CS with a length of 68mm, is 54mm shorter. Besides being longer, the Sigma 24-70mm F2.8 II also has a larger diameter of 88mm compared to the Samyang 21mm F1.4 ED AS UMC CS's 64mm diameter.
Below you can find a scaled side-by-side image of Sigma 24-70mm F2.8 II and Samyang 21mm F1.4 ED AS UMC CS to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 24-70mm F2.8 II and the Samyang 21mm F1.4 ED AS UMC CS 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. Samyang 21mm F1.4 ED AS UMC CS weighs 275g, 62% (460g) lighter than the Sigma 24-70mm F2.8 II's weight of 735g.
Filter Threads
The Sigma 24-70mm F2.8 II has a filter size of 82mm whereas the Samyang 21mm F1.4 ED AS UMC CS has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 82mm filters that we recommend you to consider for the Sigma 24-70mm F2.8 II:
And these are the 58mm filters that we recommend for the Samyang 21mm F1.4 ED AS UMC CS:
Lens Mounts
The Sigma 24-70mm F2.8 II has the Sony E lens mount whereas the Samyang 21mm F1.4 ED AS UMC CS has the Fujifilm X lens mount . Some of the latest released cameras that are compatible with these mounts are Sony FX5 , Sony A7R VI and Sony A7 V for the Sony E Mount and Fujifilm X-T30 III , Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount.
Canon EF-M , Micro Four Thirds and Sony E mounts.
Focal Range
Sigma 24-70mm F2.8 II has a focal range of 24-70mm and
2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
36 - 105mm .
On the other hand, the Samyang 21mm F1.4 ED AS UMC CS is a prime lens with fixed focal lenght of 21mm which has an effective (full-frame 35mm equivalent) focal range of 31.5mm when used on a APS-C / DX format camera.
