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 Olympus ED 7-14mm F2.8 PRO 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. Olympus ED 7-14mm F2.8 PRO is the longer of the two lenses at 106mm. The OM System 12-40mm F2.8 PRO II with a length of 84mm, is 22mm shorter. Besides being longer, the Olympus ED 7-14mm F2.8 PRO also has a larger diameter of 79mm compared to the OM System 12-40mm F2.8 PRO II's 70mm diameter.
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Below you can find a scaled side-by-side image of OM System 12-40mm F2.8 PRO II and Olympus ED 7-14mm F2.8 PRO to get a better idea of how their sizes compare in real life.
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 12-40mm F2.8 PRO II weighs 382g, which means it is 152g (28%) lighter than the Olympus ED 7-14mm F2.8 PRO which has a weight of 534g.
Lens Mounts
Both the OM System 12-40mm F2.8 PRO II and the Olympus ED 7-14mm F2.8 PRO 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-1 II, Panasonic G9 II and OM System OM-5.
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 Olympus ED 7-14mm F2.8 PRO has a focal range of 7-14mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 14-28mm when used on a FourThirds format camera.