Great Post Ken !
I've been thinking about the method of flash exposure in the way that
you have specified, though not as clarified as what you have presented.
Can you comment on my current working method? Which was developed
somewhat instinctively and so not so precise.
Using an OM4 or Leica M6 on manual, I set my T32 on Auto at f5.6 or 8 or
whatever and make sure my subject is never more than a certain distance
away. Then I set my shutter speed at the limits of handholdability, say
1/8 or 1/15 to "brighten" up the background. I always use ISO 400 film
so that part is set. This method in my experience works pretty well.
Only drawback is that the ratio between flash and ambient lighting is
not predictable.
--Adi
AG Schnozz wrote:
> Just to clarify something here: When I refer to the ambient
> reading, think of this as the background. Your flash will light
> your subject and the ambient light will take care of the
> background. Usually the distances are such that your flash will
> have negligable affect on the background.
>
> So, the question you ask yourself is: "How many stops below do
> I want the background"? With wide latitude, good handling films
> like Portra, I typically go two stops. This gives the
> background a nice warm glow without going black. Your subjects
> will stand out from the background without looking like cave
> dwellers. Slide films usually need tighter ratios of 1:2-1:3.
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