The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 21mm F1.4 ED AS UMC CS and the Sigma 24mm F2 DG DN C 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 24mm F2 DG DN C is the longer of the two lenses at 72mm. The Samyang 21mm F1.4 ED AS UMC CS with a length of 68mm, is 4mm shorter. Besides being longer, the Sigma 24mm F2 DG DN C also has a larger diameter of 70mm compared to the Samyang 21mm F1.4 ED AS UMC CS 's 64mm diameter.
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Below you can find a scaled side-by-side image of Samyang 21mm F1.4 ED AS UMC CS and Sigma 24mm F2 DG DN C 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. Samyang 21mm F1.4 ED AS UMC CS weighs 275g, which means it is 90g (24%) lighter than the Sigma 24mm F2 DG DN C which has a weight of 365g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Sony E Mount for size comparison purposes.
Wideangle Lenses in Sony E Mount for Size Comparison
Filter Threads
The Samyang 21mm F1.4 ED AS UMC CS has a filter size of 58mm whereas the Sigma 24mm F2 DG DN C 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 Samyang 21mm F1.4 ED AS UMC CS :
And these are the 62mm filters that we recommend for the Sigma 24mm F2 DG DN C:
Lens Mounts
Both the Samyang 21mm F1.4 ED AS UMC CS and the Sigma 24mm F2 DG DN C has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A6700, Sony FX30 and Sony ZV-E10.
Samyang 21mm F1.4 ED AS UMC CS is also available in Canon EF-M , Fujifilm X and Micro Four Thirds mounts.
Sigma 24mm F2 DG DN C is also available in Leica L mount.
Focal Range
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.
On the other hand, the Sigma 24mm F2 DG DN C is a prime lens with fixed focal lenght of 24mm which has an effective (full-frame 35mm equivalent) focal range of 36mm when used on a 35mm FF format camera.