The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF 200-800mm and the Sigma 20mm F1.8 EX DG 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 200-800mm is the longer of the two lenses at 314mm. The Sigma 20mm F1.8 EX DG RF with a length of 90mm, is 224mm shorter. Besides being longer, the Canon RF 200-800mm also has a larger diameter of 102mm compared to the Sigma 20mm F1.8 EX DG RF's 89mm 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 20mm F1.8 EX DG RF weighs 520g, 74% (1530g) lighter than the Canon RF 200-800mm's weight of 2050g.
Filter Threads
The Canon RF 200-800mm has a filter size of 95mm whereas the Sigma 20mm F1.8 EX DG RF 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 95mm filters that we recommend you to consider for the Canon RF 200-800mm:
And these are the 82mm filters that we recommend for the Sigma 20mm F1.8 EX DG RF:
Lens Mounts
The Canon RF 200-800mm has the Canon RF lens mount whereas the Sigma 20mm F1.8 EX DG RF has the Sigma SA 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 Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill for the Sigma SA Mount.
Sigma 20mm F1.8 EX DG RF is also available in Canon EF , Nikon F (DX), Pentax KAF and Sony Alpha mounts.
Focal Range
Canon RF 200-800mm has a focal range of 200-800mm and
4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
320 - 1280mm.
On the other hand, the Sigma 20mm F1.8 EX DG RF is a prime lens with fixed focal lenght of 20mm.
