The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF 20-50mm F4 and the Canon RF 50mm F1.2L 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 RF 50mm F1.2L USM is the longer of the two lenses at 108mm. The Canon RF 20-50mm F4 with a length of 98mm, is 10mm shorter. Besides being longer, the Canon RF 50mm F1.2L USM also has a larger diameter of 90mm compared to the Canon RF 20-50mm F4's 80mm 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. Canon RF 20-50mm F4 weighs 420g, which means it is 530g (55%) lighter than the Canon RF 50mm F1.2L USM which has a weight of 950g.
Filter Threads
The Canon RF 20-50mm F4 has a filter size of 67mm whereas the Canon RF 50mm F1.2L 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 67mm filters that we recommend you to consider for the Canon RF 20-50mm F4:
And these are the 77mm filters that we recommend for the Canon RF 50mm F1.2L USM:
Lens Mounts
Both the Canon RF 20-50mm F4 and the Canon RF 50mm F1.2L USM 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 20-50mm F4 has a focal range of 20-50mm 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
32 - 80mm.
On the other hand, the Canon RF 50mm F1.2L USM is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 80mm.
