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 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 18-200mm F3.5-6.3 DC OS HSM is the longer of the two lenses at 98mm. The Tamron 18-200mm F3.5-6.3 Di II VC with a length of 97mm is 1mm shorter. Besides being longer, the Sigma 18-200mm F3.5-6.3 DC OS HSM also has a larger diameter of 79mm compared to Tamron 18-200mm F3.5-6.3 Di II VC's 75mm 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 200g (33%) lighter than the Sigma 18-200mm F3.5-6.3 DC OS HSM which has a weight of 600g.
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
Lens Mounts
Both Tamron 18-200mm F3.5-6.3 Di II VC and Sigma 18-200mm F3.5-6.3 DC OS HSM 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 OS HSM is also available in Nikon F (DX) and Sigma SA mounts.
Focal Range