Originally Posted by analoguey
True, they do, but the off camera flash that I haven't doesn't put put enough for me to be able to use that speed.
And the Nikons max at 200 or thereabouts anyways.
Very interesting discussion this has spawned, though! :-)
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Flash is not effected by shutter speed. So you can shoot at 1/125 or 1/400 and the flash result is the same. The shutter speed (with aperture and ISO) does control the ambient light.