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 Samyang 35mm F1.2 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. Samyang 35mm F1.2 is the longer of the two lenses at 74mm. The Samyang 21mm F1.4 ED AS UMC CS with a length of 68mm, is 6mm shorter. Besides being longer, the Samyang 35mm F1.2 also has a larger diameter of 68mm 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 Samyang 35mm F1.2 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 145g (34%) lighter than the Samyang 35mm F1.2 which has a weight of 420g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Canon EF-M Mount for size comparison purposes.
Wideangle Lenses in Canon EF-M Mount for Size Comparison
Filter Threads
The Samyang 21mm F1.4 ED AS UMC CS has a filter size of 58mm whereas the Samyang 35mm F1.2 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 Samyang 35mm F1.2:
Lens Mounts
Both the Samyang 21mm F1.4 ED AS UMC CS and the Samyang 35mm F1.2 has the same Canon EF-M lens mount. Some of the latest released cameras that are compatible with the Canon EF-M lenses are Canon M50 II, Canon M200 and Canon M6 MII.
Samyang 21mm F1.4 ED AS UMC CS is also available in Fujifilm X , Micro Four Thirds and Sony E mounts.
Samyang 35mm F1.2 is also available in Fujifilm X , Micro Four Thirds and Sony E mounts.
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
33.6mm when used on a APS-C / DX format camera.
On the other hand, the Samyang 35mm F1.2 is a prime lens with fixed focal lenght of 35mm which has an effective (full-frame 35mm equivalent) focal range of 52.5mm when used on a APS-C / DX format camera.