The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 150-600mm F5-6.3 DG OS HSM C and the Sony 75-300mm F4.5-5.6 for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 150-600mm F5-6.3 DG OS HSM C is the longer of the two lenses at 260mm. The Sony 75-300mm F4.5-5.6 with a length of 122mm is 138mm shorter. Besides being longer, the Sigma 150-600mm F5-6.3 DG OS HSM C also has a larger diameter of 105mm compared to Sony 75-300mm F4.5-5.6's 71mm 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. Sony 75-300mm F4.5-5.6 weighs 460g, 76% (1470g) lighter than the Sigma 150-600mm F5-6.3 DG OS HSM C's weight of 1930g.
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 Sigma 150-600mm F5-6.3 DG OS HSM C and Sony 75-300mm F4.5-5.6 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 150-600mm F5-6.3 DG OS HSM C is also available in Canon EF , Nikon F (FX) and Sigma SA mounts.
Focal Range
Sigma 150-600mm F5-6.3 DG OS HSM C has a focal range of 150-600mm and 4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 225 - 900mm.
Sony 75-300mm F4.5-5.6 has a focal range of 75-300mm and 4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 112.5 - 450mm.