Yes, I think most good shutter tester will measure integrate of light,
I always use flash meter to measure shutter speed which is very
accurate. Few years ago I had checked my three Bronica SQ lenses, they
all are around 0.5 stop slower at 1/500s and wide open, which is the
same as I have seen a test report on Bronica lens test long time ago,
also very close to what John H. mentioned.
Yes, stopping down the aperture may help, I remember there are some
P&S that quote higher shutter speed at smaller aperture.
C.H.Ling
HI100@xxxxxxx wrote:
>
> John ( omtech@xxxxxxxxx) writes:
>
> << And almost ALL leaf shutters are, at best, 1/350th, when set to 1/500th. >>
>
> In testing leaf shutters the test equipment makes a difference as to what
> number you get since the travel time of the blades becomes part of the
> exposure at 1/500 (a sort of variable aperture during exposure). To measure
> the "time" accurately it ideally should intergrate the light and measure
> exposure rather . This also means the exposure may vary somewhat as the
> aperture is topped down depending on how close the shutter and diaphram are
> and the shutter travel time.
>
> Tim Hughes
>
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