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So far as I understand it he variation of the 'speed' of
a focal plane shutter is obtained by varying the width of the slot in the blind
of a shutter which, in fact, moves at a constant speed. It has been suggested
that varying the width a slot in a gravity actuated shutter in front of the lens
would not have the same effect of varying the speed. If this is so, why would
the effect vary between the two types of shutter ?
Terry
Terry King
FRPS
RPS Historical Group (Chairman) www.hands-on-pictures.com/ Moderated Discussion Group Post message: artaltphot@xxxxxxxxxxxxxxxxx Subscribe: artaltphot-subscribe@xxxxxxxxxxxxxxxxx Unsubscribe: artaltphot-unsubscribe@xxxxxxxxxxxxxxxxx 1. An excellent thing is as rare as it is difficult.(Spinoza) 2. A man's reach should be beyond his grasp or what's a heaven for.(Browning) 3. Frustra fit per plura quod potest fieri per pauciora.(Occam's razor or 'Keep it simple!'). 4. Nullius in Verba (Horace), 'Take no man's word for it' (motto of the Royal Society). 5. If ignorance is bliss, why are not more people happy ? (anon) |
