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.. Shoot wildlife and birds
...already have 200-400 F4L
....600 mmF4L MKII
... 70-200 2.8L MK II
... to be used with
..1Dx
..7D MK II
..5DsR
And...
You can not handhold a camera with most lenses due to physical condition but want a lighter lens to try without compromising image quality ???