The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic G 25mm F1.7 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. Panasonic G 25mm F1.7 is the longer of the two lenses at 52mm. The Sigma 19mm F2.8 EX DN with a length of 46mm, is 6mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 61mm.
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 G 25mm F1.7 weighs 125g, which means it is 15g (10%) lighter than the Sigma 19mm F2.8 EX DN which has a weight of 140g.
Filter Threads
Both the Panasonic G 25mm F1.7 and the Sigma 19mm F2.8 EX DN 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
Both the Panasonic G 25mm F1.7 and the Sigma 19mm F2.8 EX DN has the same Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with the Micro Four Thirds lenses are OM System OM-3 Astro, OM System OM-5 II and OM System OM-3.
Sigma 19mm F2.8 EX DN is also available in Sony E mount.
Focal Range
Panasonic G 25mm F1.7 is a prime lens with fixed focal lenght of 25mm which has an effective (full-frame 35mm equivalent) focal range of
50mm when used on a FourThirds 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.
