What is the Canon RF 100-500mm F4.5-7.1 L IS USM Lens's maximum aperture opening at 400mm?
Answer 1: When the camera is set to 1/3-stop increments, the maximum 400mm aperture reported to the camera is rounded to f/6.3.
Answer 2: When the camera is set to 1/2-stop increments, the maximum 400mm aperture reported to the camera is rounded to f/5.6.
I know, you are now planning to change your R5 and R6 to use 1/2-stop increments. Don't bother as the difference is how the actual opening size is rounded (the true aperture is likely between these two numbers), likely holds for only a short range of focal lengths, and even if there was a 1/3-stop difference, the difference in noise made visible by an offsetting 1/3-stop ISO change will not matter to most.
The Canon RF 100-500mm F4.5-7.1 L IS USM Lens Review page is loaded with expectations. This lens should be awesome.
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