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 II and the Sigma 70-300mm F4-5.6 DG OS 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. Sony 70-300mm F4.5-5.6 G SSM II 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 II also has a larger diameter of 83mm compared to the Sigma 70-300mm F4-5.6 DG OS's 77mm diameter.
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. Sigma 70-300mm F4-5.6 DG OS weighs 610g, 18% (140g) lighter than the Sony 70-300mm F4.5-5.6 G SSM II's weight of 750g.
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 70-300mm F4.5-5.6 G SSM II and the 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.
Focal Range
Both lenses have the same focal range of 70-300mm but while Sony 70-300mm F4.5-5.6 G SSM II has the fastest aperture of F4.5 - F5.6, the Sigma 70-300mm F4-5.6 DG OS's widest aperture value is F4.0 - F5.6.