The 400 f4 DO is a surprise. It's "cool" in one way as it shows Canon is still working on DO lenses, so it might prove quite popular if it can combine great IQ in a smaller and lighter package. But it's only "interesting" to me from a technical perspective, in the same way the 200-400 w/1.4 extender is--interesting to read about and dream about, but way beyond the price I can afford. A 100-400 replacement though is something I could realistically save for and purchase, so I do hope they do release one soon! I'd think the 100-400 is more due for replacement than the 400 f4 DO and it is likely to be a bigger 'volume' seller.
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