The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF 28-70mm F2.8 and the Sigma 18-50mm F2.8 DC DN C RF 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 RF 28-70mm F2.8 is the longer of the two lenses at 92mm. The Sigma 18-50mm F2.8 DC DN C RF with a length of 75mm, is 17mm shorter. Besides being longer, the Canon RF 28-70mm F2.8 also has a larger diameter of 77mm compared to the Sigma 18-50mm F2.8 DC DN C RF's 69mm diameter.
Below you can find a scaled side-by-side image of Canon RF 28-70mm F2.8 and Sigma 18-50mm F2.8 DC DN C RF to get a better idea of how their sizes compare in real life.
Comparison image of the Canon RF 28-70mm F2.8 and the Sigma 18-50mm F2.8 DC DN C RF Size and Weight 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 18-50mm F2.8 DC DN C RF weighs 300g, 39% (194g) lighter than the Canon RF 28-70mm F2.8's weight of 494g.
Below you can find the dimension and weight table of the Standard Zoom Lenses in Canon RF Mount for size comparison purposes.
Standard Canon RF Mount
Filter Threads
The Canon RF 28-70mm F2.8 has a filter size of 67mm whereas the Sigma 18-50mm F2.8 DC DN C RF has a 55mm 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 Canon RF 28-70mm F2.8:
And these are the 55mm filters that we recommend for the Sigma 18-50mm F2.8 DC DN C RF:
Lens Mounts
Both the Canon RF 28-70mm F2.8 and the Sigma 18-50mm F2.8 DC DN C RF has the same Canon RF lens mount . Some of the latest released cameras that are compatible with the Canon RF lenses are Canon R6 V , Canon R6 III and Canon C50 .
Focal Range
Canon RF 28-70mm F2.8 has a focal range of 28-70mm and
2.5X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
44.8 - 112mm .
On the other hand, the Sigma 18-50mm F2.8 DC DN C RF has a focal range of 18-50mm and 2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 28.8-80mm when used on a APS-C / DX format camera.
