Recently I was rubbished for endeavouring to help a newbie by suggesting that if he used a higher shutter speed than perhaps 1/200 he was only going to get part of his picture exposed ... a 'fact of life' since I started to use electronic flash with Leicas with a sync speed of 1/30 and 1/20 depending on model. With a contact braised to the speed wheel and the other contact mounted in the accessory shoe. Later to my boss's horror I took the top off one of his Leicas and organised an internal fitting ... it worked so I was not sacked I was then able to mount my flashgun in the accessory shoe and still have a 'plug-in' socket for the sync lead. [ Leica's of those days had removable bottoms to change film rather than opening backs of later SLRs. If you had a flashgun on a bar attached to the camera bottom it was rather cumbersome changing film. Whatever ..... I have been aware that newer flash guns can pulse their output to cover the shutter movement time at a reduced output level and my DSLR will do this with the 550EX speedlight ... if I had one.. But my reading of the 'rubbisher' is that if I had Nikon rather than Canon I could just set the camera to a special setting and use my old flashguns at high shutter speeds, all of which are a good three or four decades in age Can somebody confirm or denign?