The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 100-400mm F5-6.3 OS and the Leica SL 90-280 mm F2.8-4 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 90-280 mm F2.8-4 is the longer of the two lenses at 238mm. The Sigma 100-400mm F5-6.3 OS with a length of 197mm, is 41mm shorter. Besides being longer, the Leica SL 90-280 mm F2.8-4 also has a larger diameter of 88mm compared to the Sigma 100-400mm F5-6.3 OS's 86mm diameter.
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Below you can find a scaled side-by-side image of Sigma 100-400mm F5-6.3 OS and Leica SL 90-280 mm F2.8-4 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. Sigma 100-400mm F5-6.3 OS weighs 1135g, which means it is 575g (33%) lighter than the Leica SL 90-280 mm F2.8-4 which has a weight of 1710g.
Filter Threads
The Sigma 100-400mm F5-6.3 OS has a filter size of 67mm whereas the Leica SL 90-280 mm F2.8-4 has a 82mm 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 Sigma 100-400mm F5-6.3 OS:
And these are the 82mm filters that we recommend for the Leica SL 90-280 mm F2.8-4:
Lens Mounts
Both the Sigma 100-400mm F5-6.3 OS and the Leica SL 90-280 mm F2.8-4 has the same Leica L lens mount. Some of the latest released cameras that are compatible with the Leica L lenses are Leica SL3, Panasonic S5 II and Panasonic S5 II X.
Sigma 100-400mm F5-6.3 OS is also available in Sony E and Fujifilm X mounts.
Focal Range
Sigma 100-400mm F5-6.3 OS has a focal range of 100-400mm and
4.0X zoom ratio .
On the other hand, the Leica SL 90-280 mm F2.8-4 has a focal range of 90-280mm and 3.1X zoom ratio .