The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF 800mm F5.6L IS USM and the Canon RF 85mm F1.2L USM DS 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 800mm F5.6L IS USM is the longer of the two lenses at 432mm. The Canon RF 85mm F1.2L USM DS with a length of 117mm, is 315mm shorter. Besides being longer, the Canon RF 800mm F5.6L IS USM also has a larger diameter of 163mm compared to the Canon RF 85mm F1.2L USM DS's 103mm diameter.
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Below you can find a scaled side-by-side image of Canon RF 800mm F5.6L IS USM and Canon RF 85mm F1.2L USM DS to get a better idea of how their sizes compare in real life.
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 85mm F1.2L USM DS weighs 1195g, 61% (1945g) lighter than the Canon RF 800mm F5.6L IS USM's weight of 3140g.
Filter Threads
The Canon RF 800mm F5.6L IS USM has a filter size of 52mm whereas the Canon RF 85mm F1.2L USM DS 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 52mm filters that we recommend you to consider for the Canon RF 800mm F5.6L IS USM:
And these are the 82mm filters that we recommend for the Canon RF 85mm F1.2L USM DS:
Lens Mounts
Both the Canon RF 800mm F5.6L IS USM and the Canon RF 85mm F1.2L USM DS has the same Canon RF lens mount. Some of the latest released cameras that are compatible with the Canon RF lenses are Canon R100, Canon R8 and Canon R50.
Focal Range
Canon RF 800mm F5.6L IS USM is a prime lens with fixed focal lenght of 800mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
1280mm.
On the other hand, the Canon RF 85mm F1.2L USM DS is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 136mm.