Here's a question for the boffins.
It is often said that, in order to minimize the effects of camera shake, the maximum exposure time used ("shutter speed") should be the inverse of the lens focal length in use at the time.
However, using focal plane shutters, the actual exposure time is determined by the width of "the slit" between the first and second shutter curtain, NOT by how long this slit takes to travel across the film/sensor: this travel time remains constant for a given camera whether the expsure time is 1/1,000, 1/100, 1/10, or 1/4 of a second!
Hence, the film/sensor is exposed to the same degree of lens "shake" no matter which of the above exposure times is used.
So, unless using very slow "bulb" type exposure times, it would seem the "inverse of the focal length rule" can't be applied with cameras other than those with a leaf or an electronic shutter.
Is this right or not?