im not sure but did you really need 1/1600
as far as i know even the wings of a helicopter become iced by that shutterspeed... though i have no expierience to tell if i am right so..; just asking.
but ofcourse you were right with your tread!
high iso can come in handy. though my 400D only goes to 1600 (no mid-levels... 100 200 400 800 1600)
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