The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica SL 28-70mm f2.8 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. Leica SL 28-70mm f2.8 is the longer of the two lenses at 102mm. The OM System 12-40mm F2.8 PRO II with a length of 84mm, is 18mm shorter. Besides being longer, the Leica SL 28-70mm f2.8 also has a larger diameter of 73mm 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 Leica SL 28-70mm f2.8 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 Leica SL 28-70mm f2.8 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, 33% (190g) lighter than the Leica SL 28-70mm f2.8's weight of 572g.
Filter Threads
The Leica SL 28-70mm f2.8 has a filter size of 67mm 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 67mm filters that we recommend you to consider for the Leica SL 28-70mm f2.8:
And these are the 62mm filters that we recommend for the OM System 12-40mm F2.8 PRO II:
Lens Mounts
The Leica SL 28-70mm f2.8 has the Leica L 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 Leica SL3-P , Panasonic S1 II and Panasonic S1 IIE for the Leica L 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
Leica SL 28-70mm f2.8 has a focal range of 28-70mm and
2.5X zoom ratio .
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.
