The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony 70-300mm F4.5-5.6 G SSM and the Sigma 70-300mm F4-5.6 DG OS for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sony 70-300mm F4.5-5.6 G SSM is the longer of the two lenses at 136mm. The Sigma 70-300mm F4-5.6 DG OS with a length of 126mm is 10mm shorter. Besides being longer, the Sony 70-300mm F4.5-5.6 G SSM also has a larger diameter of 83mm compared to Sigma 70-300mm F4-5.6 DG OS's 77mm diameter.
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. Sigma 70-300mm F4-5.6 DG OS weighs 610g, 19% (150g) lighter than the Sony 70-300mm F4.5-5.6 G SSM's weight of 760g.
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
Both Sony 70-300mm F4.5-5.6 G SSM and Sigma 70-300mm F4-5.6 DG OS 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 70-300mm F4-5.6 DG OS is also available in Canon EF , Nikon F (FX), Pentax KAF3 and Sigma SA mounts.