The type of photography that you are planning to use is an important decision factor. Here we have evaluated the OM System 17mm F1.8 II 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. Sigma 19mm F2.8 EX DN is the longer of the two lenses at 46mm. The OM System 17mm F1.8 II 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 OM System 17mm F1.8 II'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. OM System 17mm F1.8 II weighs 112g, which means it is 28g (19%) lighter than the Sigma 19mm F2.8 EX DN which has a weight of 140g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Micro Four Thirds Mount for size comparison purposes.
Wideangle Lenses in Micro Four Thirds Mount for Size Comparison
Filter Threads
Both the OM System 17mm F1.8 II 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 OM System 17mm F1.8 II 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
OM System 17mm F1.8 II is a prime lens with fixed focal lenght of 17mm which has an effective (full-frame 35mm equivalent) focal range of
34mm 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.
