The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 55-250mm f4-5.6 IS and the Sigma 18-200mm f3.5-6.3 II DC OS HSM 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 55-250mm f4-5.6 IS is the longer of the two lenses at 108mm. The Sigma 18-200mm f3.5-6.3 II DC OS HSM with a length of 88mm, is 20mm shorter. On the other hand, the Sigma 18-200mm f3.5-6.3 II DC OS HSM has a larger diameter of 75mm compared to the Canon 55-250mm f4-5.6 IS's 70mm 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. Canon 55-250mm f4-5.6 IS weighs 390g, which means it is 100g (20%) lighter than the Sigma 18-200mm f3.5-6.3 II DC OS HSM which has a weight of 490g.
Filter Threads
The Canon 55-250mm f4-5.6 IS has a filter size of 58mm whereas the Sigma 18-200mm f3.5-6.3 II DC OS HSM 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 58mm filters that we recommend you to consider for the Canon 55-250mm f4-5.6 IS:
And these are the 62mm filters that we recommend for the Sigma 18-200mm f3.5-6.3 II DC OS HSM:
Lens Mounts
The Canon 55-250mm f4-5.6 IS has the Canon EF-S lens mount whereas the Sigma 18-200mm f3.5-6.3 II DC OS HSM 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 II DC OS HSM is also available in Nikon F (DX) and Sigma SA mounts.
Focal Range
Canon 55-250mm f4-5.6 IS has a focal range of 55-250mm and
4.5X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
88-400mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 18-200mm f3.5-6.3 II DC OS HSM has a focal range of 18-200mm and 11.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 28.8-320mm when used on a APS-C / DX format camera.
