I'm keeping my 400mm DO II. I just won't use it with the 2X extender anymore and will use the RF 200-800mm instead.But, but 400mm DO II is so nice. And there is also the 1.4XIII albeit only for a 560mm f/5.6 lens. I had some reservations for the IQ at 800 at f/8 too and you do not make it easy sir with your exceptional scientific tests. I still love it though (I just have to find a use for it : OK until I sell my last 2 FF DSLR Canon cameras it stays! )
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