tomscott said:As described in the looking for big whites thread...
The problem with Canon updating the 400mm F5.6 is that currently it pretty much equals sharpness of all the other big white primes and 200-400mm at 400mm F5.6, its much smaller, lighter and 1/10th the price of many. With high ISO capabilities of the new gen of cameras high ISO you can get away with F5.6 its also useful when you need a little more DOF on FF. If they made a new one with weather sealing and IS it would reduce sales of the bigger whites even more. But then again would probably cost 200% more.
Same reason I'm guessing there is no 400mm F4 IS non DO because it would be smaller and lighter than the F2.8 and probably considerably cheaper, again with high ISO is F2.8 needed especially with the weight trade off. Only other reason for the F2.8 is for use with tele converters, that you can have a 800mm F5.6 or a 640 F4.
Grrrrr...
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