The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 18-200mm f3.5-5.6 IS and the Sigma 18-200mm F3.5-6.3 DC OS HSM C for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Canon 18-200mm f3.5-5.6 IS is the longer of the two lenses at 102mm. The Sigma 18-200mm F3.5-6.3 DC OS HSM C with a length of 86mm, is 16mm shorter. Besides being longer, the Canon 18-200mm f3.5-5.6 IS also has a larger diameter of 79mm compared to the Sigma 18-200mm F3.5-6.3 DC OS HSM C's 71mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Sigma 18-200mm F3.5-6.3 DC OS HSM C weighs 430g, 27% (165g) lighter than the Canon 18-200mm f3.5-5.6 IS's weight of 595g.
Filter Threads
The Canon 18-200mm f3.5-5.6 IS has a filter size of 72mm whereas the Sigma 18-200mm F3.5-6.3 DC OS HSM C has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Canon 18-200mm f3.5-5.6 IS:
And these are the 62mm filters that we recommend for the Sigma 18-200mm F3.5-6.3 DC OS HSM C:
Lens Mounts
The Canon 18-200mm f3.5-5.6 IS has the Canon EF-S lens mount whereas the Sigma 18-200mm F3.5-6.3 DC OS HSM C has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Canon T8i, Canon 90D and Canon SL3 for the Canon EF-S Mount and Canon T8i, Canon 90D and Canon SL3 for the Canon EF Mount.
Sigma 18-200mm F3.5-6.3 DC OS HSM C is also available in Nikon F (DX) , Pentax KAF3, Sony Alpha and Sigma SA mounts.
Focal Range
Both lenses have the same focal range of
18-200mm but while Canon 18-200mm f3.5-5.6 IS has the fastest aperture of
F3.5 - F5.6, the Sigma 18-200mm F3.5-6.3 DC OS HSM C's widest aperture value is
F3.5 - F6.3.