Just the PC Sync Cable that came with the flash.
Open the left side (rubber flap) of the camera, insert the the cable into the silver round circle with a center dot (camera's PC Sync Socket.
Set camera to "M", ASA/ISO to 400 on both, set 125 on camera, set camera/flash to F5.6.
atdleeatnetzerodotcom for more help.
SOURCE: I mounted the Canon 580EX II to my Canon 5D Mark
Yes. If you were able to set a faster shutter speed, then you would not expose the entire frame and would have the shadow of either the first or second shutter curtain (or both) partially masking the frame.
At higher speeds, the shutter is never fully exposed: before the first shutter curtain has finished travelling across the frame, the second one has stated it's journey. All SLR's have this issue and on some older models you could only use a maximum 1/60th of a second.
In practice though, in dark conditions the "slow" shutter speed does not affect exposure as the true exposure will be determined by how much light the flash puts out, and it puts this light out in as little as 50 microseconds (50 millionths of a second) for a modern electronic flash bulb.
Faster shutter speeds can be used successfully, but only with flashes which operate in high speed mode. What they do is to make the flash burst seem longer by rapidly firing the flash bulb many times. This trick can ensure that there is sufficient light to expose the frame at the highest shutter speeds. Shutters which operate at, say, 1/4000 may seem fast, but compared to the speed at which a single electronic flash burst operates, it's an eternity.
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