If the announcement is August expect shipment of bodies by November.
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Good point so why make it f/4 then? Making it cheaper than Nikon seeming users will stop it down slower than f/4?11-24mm f/4 would probably not have a bulge like a 14-24mm f/2.8 Nikon.
The leaked images of what is thought to be the lens shows it has a bulb lens on the front. at 11mm I can't see how it could have a flat frontal lens.