I agree with your findings on the 800 mm f11. For sunlight conditions it was great, but for anything with motion and overcast conditions it was useless for me as well.Haha!, I own the 800mm F11, and while it’s usable enough in bright sunlight, it’s next to useless for moving subjects in overcast conditions. The high ISO performance of the R5 is substantially better than the 5DS, but the degree of noise obvious in defocused backgrounds is unacceptable to me over ISO 2000.
I can only assume that your suggestion of using it with a 2x extender to reach 1600mm was a joke - you do realise that it then becomes an F22 lens?
Restricting the 800mm to F11 was a marketing decision designed to keep the size/weight low and the price below the $1000 threshold, but IMO it was a poor choice for *users*. If it had been 800mm F8 it probably would still have been light enough to hand hold and still easily transportable due to the telescoping design, but it would be a great deal more usable under a wider range of lighting conditions.
Canon, as I’ve stated before, exist to make money, and they’re better at it than any other brand, but what is best for Canon isn’t always what is best for Canon customers.
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