Sure there certainly are some physical limitations, e.g. Fuji 200mm is 10 years younger, but managed to be only 255g lighter than Canon' 200mm.The RF-S, super telephoto zoom seems curious. I’m no optical designer, but I’ve always heard that, beyond about 200 mm or so, there is not much of a size or weight savings from the 1.6 CF image circle.
Being a crop user, I like the RF-S 11-18 rumor.
The 200-500 f/4L also sounds interesting, depending on its price. probably won’t be $3K because that’s where the current 100-500 is, but $10K is a nonstarter for me.
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