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 Leica 15mm F1.7 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 Leica 15mm F1.7 with a length of 36mm, is 10mm shorter. Besides being longer, the Sigma 19mm F2.8 EX DN also has a larger diameter of 61mm compared to the Panasonic Leica 15mm F1.7's 58mm 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 Leica 15mm F1.7 weighs 115g, 17% (25g) 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 Leica 15mm F1.7 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 Leica 15mm F1.7 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 Leica 15mm F1.7 is a prime lens with fixed focal lenght of 15mm which has an effective (full-frame 35mm equivalent) focal range of 30mm when used on a FourThirds format camera.
