The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 17-40mm f1.8 and the Canon RF 24-105mm F4L IS 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 17-40mm f1.8 is the longer of the two lenses at 116mm. The Canon RF 24-105mm F4L IS with a length of 107mm, is 9mm shorter. On the other hand, the Canon RF 24-105mm F4L IS has a larger diameter of 84mm compared to the Sigma 17-40mm f1.8's 73mm 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 17-40mm f1.8 weighs 535g, which means it is 165g (23%) lighter than the Canon RF 24-105mm F4L IS which has a weight of 700g.
Filter Threads
The Sigma 17-40mm f1.8 has a filter size of 67mm whereas the Canon RF 24-105mm F4L IS 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 67mm filters that we recommend you to consider for the Sigma 17-40mm f1.8:
And these are the 77mm filters that we recommend for the Canon RF 24-105mm F4L IS:
Lens Mounts
The Sigma 17-40mm f1.8 has the Fujifilm X lens mount whereas the Canon RF 24-105mm F4L IS has the Canon RF lens mount. Some of the latest released cameras that are compatible with these mounts are Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount and Canon R6 V, Canon R6 III and Canon C50 for the Canon RF Mount.
Sigma 17-40mm f1.8 is also available in the Sony E , Leica L and Canon RF mounts.
Focal Range
Sigma 17-40mm f1.8 has a focal range of 17-40mm and
2.4X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
25.5-60mm when used on a APS-C / DX format camera.
On the other hand, the Canon RF 24-105mm F4L IS 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.
