I remember when the original Tamron 200-400mm came out, and people were salivating over it. Not sharp enough, even way back then. When the Canon 200-400mm arrived and turned out to be sharp, I thought I might start saving for it. Now? I'm saving for the 300-600mm since I can believe that if-ever/whenever it arrives it will be what I'm really looking for.
I would,be much better if it was f4 then 5.6 with the Tele....
I think,I would be all over it at 10-15k
At f4 it would be Big and, considering the price for the 600 f4L IS II and the 200-400, I would be very surprised if it came out below 15-16k. Tempting thought though.
1DXII, 5DIV, 5DSR, 8-15/4L, 11-24/4L, 16-35/2.8L III, 24-70/28L II, 70-200/2.8L IS II, 100-400/4.5-5.6L IS II, 200-400/4L IS 1.4x, 17/3.5L TS-E, 24/4L TS-E, 35/1.4L II, 100/2.8L IS Macro, 300/2.8L IS II, 600/4L IS II, Zeiss: 15/2.8, 35/1.4, 55/1.4 Otus, 85/1.4 Otus, Profoto B1