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 70-300mm F4-5.6 DG 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 70-300mm F4-5.6 DG is the longer of the two lenses at 122mm. The Sony DT 55-200mm F4-5.6 SAM with a length of 85mm, is 37mm shorter. Besides being longer, the Sigma 70-300mm F4-5.6 DG also has a larger diameter of 77mm compared to the Sony DT 55-200mm F4-5.6 SAM's 72mm 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. Sony DT 55-200mm F4-5.6 SAM weighs 305g, which means it is 245g (44%) lighter than the Sigma 70-300mm F4-5.6 DG which has a weight of 550g.
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 DT 55-200mm F4-5.6 SAM and the Sigma 70-300mm F4-5.6 DG 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 70-300mm F4-5.6 DG is also available in Canon EF , Nikon F (FX), Pentax KAF, Sigma SA, Canon EF, Nikon F (FX), Pentax KAF, Sony Alpha and Sigma SA 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 an effective (full-frame 35mm equivalent) focal range of 82.5-300mm when used on a APS-C / DX format camera. Sigma 70-300mm F4-5.6 DG has a focal range of 70-300mm and 4.3X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 105 - 450mm.