Look at the data. The Nikon 200-500/5.6 and Sony 200-600/6.3 are ~2.1-2.4kg and $1000-1800, which are cheaper than and far less than 2x wt of current 100-400mm II, which weighs ~1.7kg with hood and foot and costs ~$1900 here. (I am equating £ and $ to remove VAT from UK prices).Kindly put. This will be a 1.5kg ~$2500 lens. Even bumping the objective diameter by 25% and scaling the rest to get f5.6 at 500 makes this a very different lens that could be 2x the weight and 2-3x the price, approaching the 200-400 f4. But I might not be considering what you would propose for that “extra reach”.
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