The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 19mm F2.8 EX DN and the Panasonic 20mm F1.7 II ASPH 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 19mm F2.8 EX DN is the longer of the two lenses at 46mm. The Panasonic 20mm F1.7 II ASPH with a length of 26mm, is 20mm shorter. On the other hand, the Panasonic 20mm F1.7 II ASPH has a larger diameter of 63mm 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. Panasonic 20mm F1.7 II ASPH weighs 87g, 37% (53g) lighter than the Sigma 19mm F2.8 EX DN's weight of 140g.
Filter Threads
Both the Sigma 19mm F2.8 EX DN and the Panasonic 20mm F1.7 II ASPH have the same Filter thread size of 46mm.
Below are links to the 46mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Sigma 19mm F2.8 EX DN has the Sony E lens mount whereas the Panasonic 20mm F1.7 II ASPH has the Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount and OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Sigma 19mm F2.8 EX DN is also available in the Micro Four Thirds mount.
Focal Range
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.
On the other hand, the Panasonic 20mm F1.7 II ASPH is a prime lens with fixed focal lenght of 20mm which has an effective (full-frame 35mm equivalent) focal range of 40mm when used on a FourThirds format camera.
