The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 18-200mm F3.5-6.3 DC and the Sigma 18-125mm F3.8-5.6 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 18-125mm F3.8-5.6 DC OS HSM is the longer of the two lenses at 89mm. The Sigma 18-200mm F3.5-6.3 DC with a length of 78mm, is 11mm shorter. Besides being longer, the Sigma 18-125mm F3.8-5.6 DC OS HSM also has a larger diameter of 74mm compared to the Sigma 18-200mm F3.5-6.3 DC'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. Sigma 18-200mm F3.5-6.3 DC weighs 405g, which means it is 85g (17%) lighter than the Sigma 18-125mm F3.8-5.6 DC OS HSM which has a weight of 490g.
Below you can find the dimension and weight table of the SuperZoom Lenses in Sigma SA Mount for size comparison purposes.
Superzoom Lenses in Sigma SA Mount for Size Comparison
Filter Threads
The Sigma 18-200mm F3.5-6.3 DC has a filter size of 62mm whereas the Sigma 18-125mm F3.8-5.6 DC OS HSM has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Sigma 18-200mm F3.5-6.3 DC:
And these are the 67mm filters that we recommend for the Sigma 18-125mm F3.8-5.6 DC OS HSM:
Lens Mounts
Both the Sigma 18-200mm F3.5-6.3 DC and the Sigma 18-125mm F3.8-5.6 DC OS HSM has the same Sigma SA lens mount. Some of the latest released cameras that are compatible with the Sigma SA lenses are Sigma SD1 Merrill, Sigma SD1 and .
Sigma 18-200mm F3.5-6.3 DC is also available in the Canon EF , Nikon F (DX), Pentax KAF and Sony Alpha mounts.
Sigma 18-125mm F3.8-5.6 DC OS HSM is also available in Canon EF and Nikon F (DX) mounts.
Focal Range
Sigma 18-200mm F3.5-6.3 DC has a focal range of 18-200mm and
11.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27-300mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 18-125mm F3.8-5.6 DC OS HSM has a focal range of 18-125mm and 6.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-187.5mm when used on a APS-C / DX format camera.
