1/25/02 7:55:31 AM, ClassicVW@xxxxxxx wrote:
> On Fri, 25 Jan 2002 Tom@xxxxxxxxxxxxx wrote:
>
> > 1. Some light from the diffuser reached the sensor, shutting it off too
> > soon.
>
> I'd have to disagree with this. I've employed Acer's method before (with the
> curved piece of opaque plastic). Mine was from a plastic milk gallon which
> may be a lot thinner and more 'clear' than the alcohol bottle he used. I've
i dunno, the plastic milk i've seen here are pretty close in terms of
translucency (as i see it, not measured!)
> had mine curved to actually allow light to spill over the top and bottom of
> the plastic piece, and I've had no problem with the light being directed
> into the sensor. Maybe my curve is closer to the flash and doesn't bounce it
> back? I make the plastic *a bit* shorter (top to bottom) than the flash
> tube's height so *some* light gets out directly, but the "hot" part of the
> tube is softened thru the plastic.
ditto: flush fit on the side, just about the height of the flashtube, but
curved SLIGHTLY out, so there's some
spill light
> I also suspect that Acer's plastic interfered with the flash output more
> than the reported 1/3 stop the flash meter told him. I'd bet a roll of film
> it was closer to two stops considering the material used. That, and if it
> was in a large reception hall, did him in.
measured loss was ~1/2-2/3 stop, using gossen scout aimed at the sky, w/ and
w/o the plastic piece. it
would appear the loss as shown on the negs is at least a stop :( but then try
this:
figure one stop light loss. filmspeed is 80 for GN calcs. T32 panel at ISO80
shows 12ft for f8... that's what i
used!
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