some meters give a reading that COMBINES both
the flash light and the ambient light. Setting
the sync speed correctly is the only way to get
a true reading. If ambient light is low, the point is
moot, but that is not always the case.
JCO
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Aaron Reynolds
> Sent: Thursday, March 14, 2002 6:01 PM
> To: [EMAIL PROTECTED]
> Subject: Re: anyone know the Minolta IIIF meter?
>
>
> On Thursday, March 14, 2002, at 05:05 PM, Bill D. Casselberry wrote:
> > 2nd question (for future reference) :
> >
> > If/when I get studio strobes will I have to mentally adjust
> > anything to use it w/ the 6x7's 1/30th flash sync? It has
> > settings for 1/60th & 1/250th
>
> Flash exposure is not determined at all by shutter speed, only the
> ambient light is.
>
> Here's the quick explanation:
>
> Your flash fires at something like 1/4000 of a second. The camera's
> flash sync is simply the fastest speed that the shutter can be
> guaranteed to be open for during the firing of the flash -- above that
> speed, part of the image will be dark, because the shutter either has
> not fully opened or is already closing when the flash fires. It's
> actually a little more complex than this (it has to do with the two
> curtains of the shutter and the fact that at some shutter speeds the
> shutter is not all open at the same time, depending on how fast the
> curtains travel), but this explanation works. ;)
>
> So, the only thing that governs flash exposure is the aperture. That's
> why you can shoot a shot at, say, 1/60 f8 with flash and another at 1/15
> f8 with flash, and in both the subject will be exposed (by the flash)
> the same, but the background will be much lighter (and probably shaky)
> in the second shot.
>
> -Aaron
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