The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony DT 18-200mm F3.5-6.3 and the Sigma 18-200mm F3.5-6.3 DC for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sony DT 18-200mm F3.5-6.3 is the longer of the two lenses at 86mm. The Sigma 18-200mm F3.5-6.3 DC with a length of 78mm is 8mm shorter. Besides being longer, the Sony DT 18-200mm F3.5-6.3 also has a larger diameter of 73mm compared to Sigma 18-200mm F3.5-6.3 DC's 70mm 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.
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
Lens Mounts
Both Sony DT 18-200mm F3.5-6.3 and Sigma 18-200mm F3.5-6.3 DC 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 18-200mm F3.5-6.3 DC is also available in Canon EF , Nikon F (DX), Pentax KAF and Sigma SA mounts.
Focal Range
Both lenses have the same focal range of 18-200mm and the fastest aperture of F3.5 - F6.3.