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 Sony 24-70mm F2.8 ZA SSM 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 OM System 12-40mm F2.8 PRO II and Sony 24-70mm F2.8 ZA SSM II 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 Sony 24-70mm F2.8 ZA SSM 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, which means it is 592g (60%) lighter than the Sony 24-70mm F2.8 ZA SSM II which has a weight of 974g.
Filter Threads
The OM System 12-40mm F2.8 PRO II has a filter size of 62mm whereas the Sony 24-70mm F2.8 ZA SSM II has a 77mm 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 77mm filters that we recommend for the Sony 24-70mm F2.8 ZA SSM II:
Lens Mounts
The OM System 12-40mm F2.8 PRO II has the Micro Four Thirds lens mount whereas the Sony 24-70mm F2.8 ZA SSM II has the Sony Alpha lens mount . Some of the latest released cameras that are compatible with these mounts are OM System OM-3 Astro , OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount and Sony A99 II , Sony A68 and Sony A77 II for the Sony Alpha Mount.
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 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 .
