The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 18-200mm F3.5-6.3 Di II VC 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.Tamron 18-200mm F3.5-6.3 Di II VC is the longer of the two lenses at 97mm. The Sigma 18-200mm F3.5-6.3 DC with a length of 78mm is 19mm shorter. Besides being longer, the Tamron 18-200mm F3.5-6.3 Di II VC also has a larger diameter of 75mm 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. Tamron 18-200mm F3.5-6.3 Di II VC weighs 400g, which means it is 5g (1%) lighter than the Sigma 18-200mm F3.5-6.3 DC which has a weight of 405g.
Below you can find the dimension and weight table of the 'SuperZoom Lenses in Canon EF Mount for size comparison purposes.
SuperZoom Lenses in Canon EF Mount for Size Comparison
Both Tamron 18-200mm F3.5-6.3 Di II VC and Sigma 18-200mm F3.5-6.3 DC has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon T8i, Canon 90D and Canon SL3.
Tamron 18-200mm F3.5-6.3 Di II VC is also available in Nikon F (DX) and Sony Alpha mounts.
Sigma 18-200mm F3.5-6.3 DC is also available in Nikon F (DX) , Pentax KAF, Sony Alpha and Sigma SA mounts.