The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 30mm F2.8 DN and the OM System 12-40mm F2.8 PRO II 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 30mm F2.8 DN weighs 135g, which means it is 247g (64%) lighter than the OM System 12-40mm F2.8 PRO II which has a weight of 382g.
Lens Mounts
Both the Sigma 30mm F2.8 DN and the OM System 12-40mm F2.8 PRO II has the same Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with the Micro Four Thirds lenses are , and .
Sigma 30mm F2.8 DN is also available in the Sony E mount.
Focal Range
Sigma 30mm F2.8 DN is a prime lens with fixed focal lenght of 30mm which has an effective (full-frame 35mm equivalent) focal range of
45mm when used on a APS-C / DX format camera.
On the other hand, the OM System 12-40mm F2.8 PRO II has a focal range of 12-40mm and 3.3X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 24-80mm when used on a FourThirds format camera.
