The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 70-300mm F4-5.6 DG OS 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. Sigma 70-300mm F4-5.6 DG OS is the longer of the two lenses at 126mm. The Sigma 18-200mm f3.5-6.3 II DC OS HSM with a length of 88mm, is 38mm shorter. Besides being longer, the Sigma 70-300mm F4-5.6 DG OS also has a larger diameter of 77mm compared to the Sigma 18-200mm f3.5-6.3 II DC OS HSM's 75mm 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 II DC OS HSM weighs 490g, 19% (120g) lighter than the Sigma 70-300mm F4-5.6 DG OS's weight of 610g.
Filter Threads
The Sigma 70-300mm F4-5.6 DG OS 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 Sigma 70-300mm F4-5.6 DG OS:
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 Sigma 70-300mm F4-5.6 DG OS has the Sigma SA 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 Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill for the Sigma SA Mount and Canon T8i, Canon 90D and Canon SL3 for the Canon EF Mount.
Sigma 70-300mm F4-5.6 DG OS is also available in the Canon EF , Nikon F (FX), Pentax KAF3 and Sony Alpha mounts.
Sigma 18-200mm f3.5-6.3 II DC OS HSM is also available in Nikon F (DX) and Sigma SA mounts.
Focal Range
Sigma 70-300mm F4-5.6 DG OS has a focal range of 70-300mm and
4.3X zoom ratio .
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.
