The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 17-70mm F2.8-4 DC OS HSM and the Canon 24-105mm f4L IS USM 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 24-105mm f4L IS USM is the longer of the two lenses at 107mm. The Sigma 17-70mm F2.8-4 DC OS HSM with a length of 89mm, is 18mm shorter. Besides being longer, the Canon 24-105mm f4L IS USM also has a larger diameter of 84mm compared to the Sigma 17-70mm F2.8-4 DC OS HSM's 79mm 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 17-70mm F2.8-4 DC OS HSM weighs 520g, which means it is 150g (22%) lighter than the Canon 24-105mm f4L IS USM which has a weight of 670g.
Below you can find the dimension and weight table of the Standard Zoom Lenses in Canon EF Mount for size comparison purposes.
Standard Lenses in Canon EF Mount for Size Comparison
Filter Threads
The Sigma 17-70mm F2.8-4 DC OS HSM has a filter size of 72mm whereas the Canon 24-105mm f4L IS USM 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 72mm filters that we recommend you to consider for the Sigma 17-70mm F2.8-4 DC OS HSM:
And these are the 77mm filters that we recommend for the Canon 24-105mm f4L IS USM:
Lens Mounts
Both the Sigma 17-70mm F2.8-4 DC OS HSM and the Canon 24-105mm f4L IS USM has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon T8i, Canon 90D and Canon SL3.
Sigma 17-70mm F2.8-4 DC OS HSM is also available in the Pentax KAF3 , Sony Alpha, Sigma SA and Nikon F (DX) mounts.
Focal Range
Sigma 17-70mm F2.8-4 DC OS HSM has a focal range of 17-70mm and
4.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27.2-112mm when used on a APS-C / DX format camera.
On the other hand, the Canon 24-105mm f4L IS USM has a focal range of 24-105mm and 4.4X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 38.4 - 168mm.
