The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 24-105mm F4 DG OS HSM and the Sigma 24-70mm F2.8 EX DG 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 24-70mm F2.8 EX DG is the longer of the two lenses at 116mm. The Sigma 24-105mm F4 DG OS HSM with a length of 109mm, is 7mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 89mm.
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 24-70mm F2.8 EX DG weighs 715g, 19% (170g) lighter than the Sigma 24-105mm F4 DG OS HSM's weight of 885g.
Below you can find the dimension and weight table of the Standard Zoom Lenses in Sigma SA Mount for size comparison purposes.
Standard Lenses in Sigma SA Mount for Size Comparison
Filter Threads
Both the Sigma 24-105mm F4 DG OS HSM and the Sigma 24-70mm F2.8 EX DG have the same Filter thread size of 82mm.
Below are links to the 82mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Sigma 24-105mm F4 DG OS HSM and the Sigma 24-70mm F2.8 EX DG 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 24-105mm F4 DG OS HSM is also available in Canon EF , Nikon F (FX) and Sony Alpha mounts.
Sigma 24-70mm F2.8 EX DG is also available in Canon EF , Pentax KAF, Sony Alpha and Nikon F (FX) mounts.
Focal Range
Sigma 24-105mm F4 DG OS HSM has a focal range of 24-105mm and
4.4X zoom ratio .
On the other hand, the Sigma 24-70mm F2.8 EX DG has a focal range of 24-70mm and 2.9X zoom ratio .