The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 120-300mm F2.8 DG OS HSM and the Sigma 70-200mm F2.8 EX DG HSM II 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 120-300mm F2.8 DG OS HSM is the longer of the two lenses at 291mm. The Sigma 70-200mm F2.8 EX DG HSM II with a length of 184mm, is 107mm shorter. Besides being longer, the Sigma 120-300mm F2.8 DG OS HSM also has a larger diameter of 124mm compared to the Sigma 70-200mm F2.8 EX DG HSM II's 87mm 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 70-200mm F2.8 EX DG HSM II weighs 1390g, 52% (1560g) lighter than the Sigma 120-300mm F2.8 DG OS HSM's weight of 2950g.
Below you can find the dimension and weight table of the Telephoto Zoom Lenses in Sigma SA Mount for size comparison purposes.
Telephoto Lenses in Sigma SA Mount for Size Comparison
Filter Threads
The Sigma 120-300mm F2.8 DG OS HSM has a filter size of 105mm whereas the Sigma 70-200mm F2.8 EX DG HSM II has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 105mm filters that we recommend you to consider for the Sigma 120-300mm F2.8 DG OS HSM:
And these are the 77mm filters that we recommend for the Sigma 70-200mm F2.8 EX DG HSM II:
Lens Mounts
Both the Sigma 120-300mm F2.8 DG OS HSM and the Sigma 70-200mm F2.8 EX DG HSM II has the same Sigma SA lens mount. Some of the latest released cameras that are compatible with the Sigma SA lenses are Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill.
Sigma 120-300mm F2.8 DG OS HSM is also available in the Canon EF and Nikon F (FX) mounts.
Sigma 70-200mm F2.8 EX DG HSM II is also available in Canon EF , Four Thirds, Pentax KAF3, Sony Alpha and Nikon F (FX) mounts.
Focal Range
Sigma 120-300mm F2.8 DG OS HSM has a focal range of 120-300mm and
2.5X zoom ratio .
On the other hand, the Sigma 70-200mm F2.8 EX DG HSM II has a focal range of 70-200mm and 2.9X zoom ratio .
