The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony 70-400mm F4-5.6 G SSM II and the Sigma 150-500mm F5-6.3 DG OS HSM for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Sigma 150-500mm F5-6.3 DG OS HSM is the longer of the two lenses at 252mm. The Sony 70-400mm F4-5.6 G SSM II with a length of 196mm, is 56mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 95mm.
The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Sony 70-400mm F4-5.6 G SSM II weighs 1500g, which means it is 280g (15%) lighter than the Sigma 150-500mm F5-6.3 DG OS HSM which has a weight of 1780g.
Below you can find the dimension and weight table of the Telephoto Zoom Lenses in Sony Alpha Mount for size comparison purposes.
Telephoto Zoom Lenses in Sony Alpha Mount for Size Comparison
Lens Mounts
Both the Sony 70-400mm F4-5.6 G SSM II and the Sigma 150-500mm F5-6.3 DG OS HSM has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A99 II, Sony A68 and Sony A77 II.
Sigma 150-500mm F5-6.3 DG OS HSM is also available in Canon EF , Nikon F (FX), Pentax KAF3 and Sigma SA mounts.
Focal Range
Sony 70-400mm F4-5.6 G SSM II has a focal range of 70-400mm and 5.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 105 - 600mm.
Sigma 150-500mm F5-6.3 DG OS HSM has a focal range of 150-500mm and 3.3X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 225 - 750mm.