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I have a 7D as well and still go for the 6D for most work with the 400 5.6. The higher ISO capability of the 6D allows me higher shutter speeds without noise or IQ quality issues. I don't miss the additional 1.6x crop factor.
My 400 5.6/Kenko 2.0x combo will occasionally AF, but for the most part it's manual focus only. If you can preset your focus, that shouldn't be an issue, though.
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Mark
markj.pics
"There is no shame in dropping fruit in your glass."
-UncleWede |