A big brother to the 400mm 5.6L would be very nice! Prior to the 100-400mm Markii there wasn't a better walk around lens for birding. The 400 is light, bright, and as sharp as can be hoped for. Getting something like a 500mm 5.6 would be awesome! My old 500mm 4.5 is great for tripod work, but walking with it sucks. My guess is that the 500mm f4 is also a beast.
IS would be OK, but how much weight would that add? Would you need more elements and loose IQ? Hope Canon R&D reads posts.
IS would be OK, but how much weight would that add? Would you need more elements and loose IQ? Hope Canon R&D reads posts.
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