The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony DT 18-250mm F3.5-6.3 and the Sigma 18-250mm F3.5-6.3 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 18-250mm F3.5-6.3 DC OS HSM is the longer of the two lenses at 89mm. The Sony DT 18-250mm F3.5-6.3 with a length of 86mm is 3mm shorter. On the other hand, the Sony DT 18-250mm F3.5-6.3 has a larger diameter of 75mm compared to Sigma 18-250mm F3.5-6.3 DC OS HSM's 74mm 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 18-250mm F3.5-6.3 weighs 440g, which means it is 30g (6%) lighter than the Sigma 18-250mm F3.5-6.3 DC OS HSM which has a weight of 470g.
Below you can find the dimension and weight table of the 'SuperZoom Lenses in Sony Alpha Mount for size comparison purposes.
SuperZoom Lenses in Sony Alpha Mount for Size Comparison
Both Sony DT 18-250mm F3.5-6.3 and Sigma 18-250mm F3.5-6.3 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 18-250mm F3.5-6.3 DC OS HSM is also available in Canon EF , Nikon F (DX), Pentax KAF3, Sigma SA, Canon EF, Nikon F (DX), Pentax KAF3, Sony Alpha and Sigma SA mounts.
Both lenses have the same focal range of 18-250mm and the fastest aperture of F3.5 - F6.3.