The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony 24-70mm F2.8 ZA SSM II and the OM System 12-40mm F2.8 PRO II 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. Sony 24-70mm F2.8 ZA SSM II is the longer of the two lenses at 111mm. The OM System 12-40mm F2.8 PRO II with a length of 84mm, is 27mm shorter. Besides being longer, the Sony 24-70mm F2.8 ZA SSM II also has a larger diameter of 83mm compared to the OM System 12-40mm F2.8 PRO II's 70mm diameter.
Below you can find a scaled side-by-side image of Sony 24-70mm F2.8 ZA SSM II and OM System 12-40mm F2.8 PRO II to get a better idea of how their sizes compare in real life.
Comparison image of the Sony 24-70mm F2.8 ZA SSM II and the OM System 12-40mm F2.8 PRO II 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. OM System 12-40mm F2.8 PRO II weighs 382g, 60% (592g) lighter than the Sony 24-70mm F2.8 ZA SSM II's weight of 974g.
Filter Threads
The Sony 24-70mm F2.8 ZA SSM II has a filter size of 77mm whereas the OM System 12-40mm F2.8 PRO II has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Sony 24-70mm F2.8 ZA SSM II:
And these are the 62mm filters that we recommend for the OM System 12-40mm F2.8 PRO II:
Lens Mounts
The Sony 24-70mm F2.8 ZA SSM II has the Sony Alpha lens mount whereas the OM System 12-40mm F2.8 PRO II has the Micro Four Thirds lens mount . Some of the latest released cameras that are compatible with these mounts are Sony A99 II , Sony A68 and Sony A77 II for the Sony Alpha Mount and OM System OM-3 Astro , OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Focal Range
Sony 24-70mm F2.8 ZA SSM II has a focal range of 24-70mm and
2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
36 - 105mm .
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.
