The type of photography that you are planning to use is an important decision factor. Here we have evaluated the OM System 12-40mm F2.8 PRO II and the Sigma 30mm F1.4 C 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. OM System 12-40mm F2.8 PRO II is the longer of the two lenses at 84mm. The Sigma 30mm F1.4 C with a length of 73mm, is 11mm shorter. Besides being longer, the OM System 12-40mm F2.8 PRO II also has a larger diameter of 70mm compared to the Sigma 30mm F1.4 C's 65mm diameter.
Below you can find a scaled side-by-side image of OM System 12-40mm F2.8 PRO II and Sigma 30mm F1.4 C to get a better idea of how their sizes compare in real life.
Comparison image of the OM System 12-40mm F2.8 PRO II and the Sigma 30mm F1.4 C Size and Weight 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 F1.4 C weighs 265g, 30% (117g) lighter than the OM System 12-40mm F2.8 PRO II's weight of 382g.
Filter Threads
The OM System 12-40mm F2.8 PRO II has a filter size of 62mm whereas the Sigma 30mm F1.4 C has a 52mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the OM System 12-40mm F2.8 PRO II:
And these are the 52mm filters that we recommend for the Sigma 30mm F1.4 C:
Lens Mounts
Both the OM System 12-40mm F2.8 PRO II and the Sigma 30mm F1.4 C 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 .
Sony E , Fujifilm X , Nikon Z , Leica L and Canon RF mounts.
Focal Range
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.
On the other hand, the Sigma 30mm F1.4 C 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.
