Even though the manual says 1/60th with external strobes, that does not appear to be true. I had some done some tests a while back with a Novatron setup and I shot starting at 1/60th and moving up to 1/90th, 1/180th, 1/250th, 1/350th and so forth. At 1/350th, I lost the bottom 1/3rd of the frame. At 1/500th, I had only the top half of the frame. At 1/750th I had about 1/6th at the top still there and at 1/1000th nothing (all black). The expousre appeared the same for all variants for the part of the photo visible and for everyting 1/250th down to 1/60th looked the same exactly. If someone wants to see the sequence I can probably dig it out.
Perhaps someone should contact Canon and get clarification.
Cheers,
rfs
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