A wonderful lens that is bright enough for such a focal length, and not heavy enough for strong male hands, because you need to understand that this is already long-range artillery, and all longer lenses are not designed for handheld shooting at all. So 100-400L is the case when we get everything at once: build quality, pro-level image (the lens uses a cool fluorite lens), "powerful zoom" and the ability to shoot without a tripod. Then there is the question of money, everyone will answer it for himself.
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