I've got a Nikon D7000, if I increase the shutter speed it eventually goes to the
bulb option and after that to
250, I've been told that
250/second is specifically for when using a speedlight as that's the shutter speed you use when using such equipment, the
250 option being right at the end so if the user accidentally switched to the previous speed option it'll be
bulb and will be obvious to the user that the settings are wrong.
My question is, can anyone explain why
250/second is used when using a speedlight? I understand you can use any shutter speed you like and have the flash fire when the shutter release button is pressed or at the end of the shutter release, but what's the deal with