The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 19mm F2.8 DN and the Sigma 16mm F1.4 DC DN L for their suitability to various photography scenarios:
Size and Weight Comparison
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 DN weighs 140g, which means it is 265g (65%) lighter than the Sigma 16mm F1.4 DC DN L which has a weight of 405g.
Lens Mounts
The Sigma 19mm F2.8 DN has the Sony E lens mount whereas the Sigma 16mm F1.4 DC DN L has the Leica L lens mount. Some of the latest released cameras that are compatible with these mounts are Sony A6700, Sony FX30 and Sony ZV-E10 for the Sony E Mount and Leica TL2, Leica TL and Leica T Typ 701 for the Leica L Mount.
Sigma 19mm F2.8 DN is also available in Micro Four Thirds mount.
Focal Range
Sigma 19mm F2.8 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.
On the other hand, the Sigma 16mm F1.4 DC DN L 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.