Officially, the 1-series will focus at f/8, but not beyond. There is a trick for taping certain pins on the lens mount to allow focusing at smaller max apertures. AF may work but will be slow and less reliable.
The newer 2x converters on the 70-200/4 may be a decent combination, but it probably would have to be stopped down 1 stop to be truly sharp; you'd have to test to find out. The combination will work natively on your camera, since the max aperture is f/8. You can still stop down if you wish, it's the max aperture that counts.
Message edited by author 2012-04-08 11:33:30.
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