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Teleconverter does NOT work with a 400 f5.6 on a 7D..I know I got both and tried it.
Now, Canon can and could give us 7D owners a firmware update to allow us to go that route, but they won't.
If you got a nice 5Dmk3 then you be in luck. In March, Canon is turning out a Firmware update for it so that the 400mm f5.6 will work with a 1.4x converter to f8. LUCKY Burgers..
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