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 28-45mm F1.8 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 28-45mm F1.8 is the longer of the two lenses at 151mm. The Canon RF 28-70mm F2.8 with a length of 92mm, is 59mm shorter. Besides being longer, the Sigma 28-45mm F1.8 also has a larger diameter of 88mm compared to the Canon RF 28-70mm F2.8's 77mm diameter.
Below you can find a scaled side-by-side image of Canon RF 28-70mm F2.8 and Sigma 28-45mm F1.8 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 28-45mm F1.8 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. Canon RF 28-70mm F2.8 weighs 494g, which means it is 466g (48%) lighter than the Sigma 28-45mm F1.8 which has a weight of 960g.
Filter Threads
The Canon RF 28-70mm F2.8 has a filter size of 67mm whereas the Sigma 28-45mm F1.8 has a 82mm 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 82mm filters that we recommend for the Sigma 28-45mm F1.8:
Lens Mounts
The Canon RF 28-70mm F2.8 has the Canon RF lens mount whereas the Sigma 28-45mm F1.8 has the Sony E lens mount . Some of the latest released cameras that are compatible with these mounts are Canon R6 V , Canon R6 III and Canon C50 for the Canon RF Mount and Sony FX5 , Sony A7R VI and Sony A7 V for the Sony E Mount.
Leica L mount.
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 28-45mm F1.8 has a focal range of 28-45mm and 1.6X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 42 - 67.5mm .
