[pure-silver] Re: Under exposed frame
- From: "richard l. gifford" <rlgif@xxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 03 Jan 2005 12:32:33 -0600
I'm not sure what preflashing has to do with salvaging
the thin negative under discussion, and I admit I
haven't looked at the image. But on the subject of
preflashing, without regard to any particular image, I
wonder why you would use half the light that produces
the least amount of fog. When I have a real problem, I
use all the light that produces no fog. We might not
be that far apart, but this is a desperation move for a
problem that doesn't yield to burning, so I test for
what is actually used. Sure, this might create havoc
with good highlights elsewhere in the print, so I
preflash only the area needed.
A handier way to apply this is to use a separate light
so you don't have to mess with your enlarger setup when
you find you need it. I use a 00 filtered 4 watt night
light at the ceiling, partially masked so I wind up
around 7 seconds. The distance makes the offset
insignificant. (11x14 from 4x5 with 165mm lens, plenty
of room to get by the lens stage, YMMV). I have
switches to select which system is active so I can use
the foot switch for all functions. Got a thick spot?
Flip a switch, preflash the area, flip a switch, get on
with it without losing your train of thought. Also no
guessing at how many sheets you might need.
I wouldn't call flashing an exotic procedure in my
darkroom. Given my penchant for separating shadows,
any surprises in my negatives are more likely to be too
dense.
regards... Dick Gifford
J.R. Stewart wrote:
> I bet that works Rob. Preflashing has saved me a couple times. It's not a
> common procedure. Justin will have to determine the amount of flash that
> produces the least amount of fog using non-image forming light, then half
> that to preflash the paper-- as a reference point, my preflash exposure is
> about 3 seconds with my 135 mm lens stopped down to f45 and about 25 inches
> away from the base board. A simple test strip should work, Justin.
>
> Jim
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