Re: Camera film for enlarged negatives?

From: Ryuji Suzuki ^lt;>
Date: 08/28/04-03:10:38 PM Z
Message-id: <>

From: Etienne Garbaux <>
Subject: Re: Camera film for enlarged negatives?
Date: Sat, 28 Aug 2004 16:33:42 -0400

> The high speed and panchromatic sensitivity will make life difficult, but
> not impossible. First, your exposures will be very short. Just finding a
> timer that accurately resolves these short times is not easy. Also,
> enlarger lamps don't come on instantly. The on and off times of
> incandescent lamps may be longer than your exposures, making exposure times
> hard to determine and erratic. Cold-cathode lamps take a while to come on
> and stabilize -- maybe longer than your exposure, and quite variable. So,
> what you'd really like to do is use a lens with a shutter and leave the
> enlarger lamp on (all of my enlarging lenses are shutter-mounted because I
> used to do a lot of masking work). But this has its own problems -- the
> enlarger needs to be completely light tight, because the film is so fast
> that ANY light leakage will fog it. You also need to use a flat black
> backing on the easel to prevent halation. These are not insurmountable
> problems, but it is definitely more effort than using copy film.

I keep a 135mm lens on Copal selt setting shutter on my enlarger to do
quick sensitometric tests on emulsions. Nothing expensive -- they are
135mm Tominon copy lens that fits on Copal shutter, the whole thing
came from Polaroid Land MP-4 copy camera that was waiting to be thrown
away. (That's what it was when I followed someone who told me an
enlarger was being thrown away.) Yes light leaks are a bit of
trouble. But it can be fixed without too much work. You can also use
light meter as a illuminance or luminance meter. Calibration factor
for Sekonic L-408 is printed in the instruction manual. I'm not sure
if other manufacturers print those, but they should be able to tell

Ryuji Suzuki
"You have to realize that junk is not the problem in and of itself.
Junk is the symptom, not the problem."
(Bob Dylan 1971; source: No Direction Home by Robert Shelton)
Received on Sat Aug 28 15:11:04 2004

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