The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony DT 55-200mm F4-5.6 SAM and the Sigma 50-200mm F4-5.6 DC OS HSM 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 50-200mm F4-5.6 DC OS HSM is the longer of the two lenses at 102mm. The Sony DT 55-200mm F4-5.6 SAM with a length of 85mm is 17mm shorter. Besides being longer, the Sigma 50-200mm F4-5.6 DC OS HSM also has a larger diameter of 74mm compared to Sony DT 55-200mm F4-5.6 SAM's 72mm 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 DT 55-200mm F4-5.6 SAM weighs 305g, which means it is 115g (27%) lighter than the Sigma 50-200mm F4-5.6 DC OS HSM which has a weight of 420g.
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 Sony DT 55-200mm F4-5.6 SAM and Sigma 50-200mm F4-5.6 DC 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 A68, Sony A77 II and Sony A58.
Sigma 50-200mm F4-5.6 DC OS HSM is also available in Canon EF , Pentax KAF3, Sigma SA and Nikon F (DX) mounts.
Focal Range
Sony DT 55-200mm F4-5.6 SAM has a focal range of 55-200mm and 3.6X zoom ratio which has a 35mm equivalent focal range of 82.5-300mm when used on a APS-C / DX format camera. Sigma 50-200mm F4-5.6 DC OS HSM has a focal range of 50-200mm and 4.0X zoom ratio which has a 35mm equivalent focal range of 75-300mm when used on a APS-C / DX format camera.