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Out of curiosity, I just looked up the specs of the existing Sony 400 f2.8 and compared it to the Nikon (F mount) 300 f2.8 . I was shocked to discover they weigh exactly the same! Even the Nikon Z mount 400 2.8 is almost the same - just 50 grams heavier, but it includes a built-in extender. If this is the case, I wonder how light the upcoming Sony 300 2.8 will be?
