The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 16mm f2.0 and the Sigma 19mm F2.8 EX DN 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 16mm f2.0 is the longer of the two lenses at 89mm. The Sigma 19mm F2.8 EX DN with a length of 46mm, is 43mm shorter. Besides being longer, the Samyang 16mm f2.0 also has a larger diameter of 83mm compared to the Sigma 19mm F2.8 EX DN's 61mm 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. Sigma 19mm F2.8 EX DN weighs 140g, 75% (443g) lighter than the Samyang 16mm f2.0's weight of 583g.
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 16mm f2.0 has a filter size of 77mm whereas the Sigma 19mm F2.8 EX DN has a 46mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Samyang 16mm f2.0:
And these are the 46mm filters that we recommend for the Sigma 19mm F2.8 EX DN:
Lens Mounts
Both the Samyang 16mm f2.0 and the Sigma 19mm F2.8 EX DN 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 16mm f2.0 is also available in Canon EF , Canon EF-M, Fujifilm X, Nikon F (DX), Four Thirds, Micro Four Thirds, Pentax KAF, Sony Alpha and Samsung NX mounts.
Sigma 19mm F2.8 EX DN is also available in Micro Four Thirds mount.
Focal Range
Samyang 16mm f2.0 is a prime lens with fixed focal lenght of 16mm which has an effective (full-frame 35mm equivalent) focal range of
24mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 19mm F2.8 EX DN is a prime lens with fixed focal lenght of 19mm which has an effective (full-frame 35mm equivalent) focal range of 28.5mm when used on a APS-C / DX format camera.