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 30mm F1.4 EX DC HSM 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 21mm F1.4 ED AS UMC CS is the longer of the two lenses at 68mm. The Sigma 30mm F1.4 EX DC HSM with a length of 59mm, is 9mm shorter. On the other hand, the Sigma 30mm F1.4 EX DC HSM has a larger diameter of 77mm compared to the Samyang 21mm F1.4 ED AS UMC CS's 64mm 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. Samyang 21mm F1.4 ED AS UMC CS weighs 275g, which means it is 155g (36%) lighter than the Sigma 30mm F1.4 EX DC HSM which has a weight of 430g.
Filter Threads
The Samyang 21mm F1.4 ED AS UMC CS has a filter size of 58mm whereas the Sigma 30mm F1.4 EX DC HSM 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 30mm F1.4 EX DC HSM:
Lens Mounts
The Samyang 21mm F1.4 ED AS UMC CS has the Micro Four Thirds lens mount whereas the Sigma 30mm F1.4 EX DC HSM has the Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount and , and for the Four Thirds Mount.
Samyang 21mm F1.4 ED AS UMC CS is also available in the Canon EF-M , Fujifilm X and Sony E mounts.
Sigma 30mm F1.4 EX DC HSM is also available in Canon EF-S , Nikon F (DX), Pentax KAF, Sony Alpha and Sigma SA 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
42mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 30mm F1.4 EX DC HSM is a prime lens with fixed focal lenght of 30mm which has an effective (full-frame 35mm equivalent) focal range of 45mm when used on a APS-C / DX format camera.
