The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron AF 18-200mm f3.5-6.3 XR II LD 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 AF 18-200mm f3.5-6.3 XR II LD is the longer of the two lenses at 84mm. The Sigma 18-200mm F3.5-6.3 DC with a length of 78mm is 6mm shorter. Besides being longer, the Tamron AF 18-200mm f3.5-6.3 XR II LD also has a larger diameter of 74mm 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 AF 18-200mm f3.5-6.3 XR II LD weighs 398g, which means it is 7g (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 Nikon F (DX) Mount for size comparison purposes.
SuperZoom Lenses in Nikon F (DX) Mount for Size Comparison
Lens Mounts
Both Tamron AF 18-200mm f3.5-6.3 XR II LD and Sigma 18-200mm F3.5-6.3 DC has the same Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (DX) lenses are Nikon D3500, Nikon D7500 and Nikon D5600.
Tamron AF 18-200mm f3.5-6.3 XR II LD is also available in Canon EF , Sony Alpha and Pentax KAF mounts.
Sigma 18-200mm F3.5-6.3 DC is also available in Canon EF , Pentax KAF, Sony Alpha 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.