Tom, the reason I proposed actually cranking film through is the question
that someone else brought up: does the reflectivity changes as film is
exposed to light? Don't know that it matters, but by cranking a fresh frame
of film through for each exposure one eliminates the question, because the
test is run just like a real-life exposure (assuming that each film has a
similar speed).
Lets let this one lie until I can run the test in a couple of weeks.
Gary Edwards
From: "Tom Trottier" <infoanim@xxxxxx>
Reply-To: olympus@xxxxxxxxxxxxxxx
To: olympus@xxxxxxxxxxxxxxx
Subject: [OM] Film reflectivity for OTF
Date: Wed, 23 Jun 1999 07:38:13 -0400
A somewhat cheaper way to do this would be to chop off 2" of the film
leader and load it behind the shutter.
Tom
(re:olympus-digest V2 #1002)
On 21 Jun 99, at 14:14, olympus-digest <olympus@xxxxxxxxxxxxxxx> wrote:
Date sent: Mon, 21 Jun 1999 14:14:44 -0700
From: owner-olympus-digest@xxxxxxxxxxxxxxx (olympus-digest)
To: olympus-digest@xxxxxxxxxxxxxxx
Subject: olympus-digest V2 #1002
Send reply to: olympus@xxxxxxxxxxxxxxx
> -----Original Message-----
> From: gary edwards <maitani@xxxxxxxxxxx>
> To: olympus@xxxxxxxxxxxxxxx <olympus@xxxxxxxxxxxxxxx>
> Date: Monday, June 21, 1999 9:02 AM
> Subject: Re: [OM] Odd OM4 behavior - oops, nevermind.
>
>
> >Film reflectivity variation is a trivial issue (I think). If it
> >concerns you, here is how to test for variation. Set up you OTF
> >capable OM
> looking
> >at a constant illumination scene. A solid wall dimly illuminated by
> >artificial light would be good. Select an aperture that gives you an
> >automatic exposure of, say, 60 s. Shoot 36 test shots with one film
> type,
> >carefully timing the exposure with a stopwatch. Load another type of
> film
> >and, without changing the film speed setting (or anything else), make
> >36 more test shots (the more the better to average out measurment
> >errors). This would be a good way to use up a couple of out of date
> >rolls. Throw
> the
> >exposed film away and report your results. Include the number of
> samples,
> >the variation of each film type (standard deviation of 36
> >measurements),
> and
> the film types. My bet is that the standard deviation for each roll
> will
> be
> about the same magnitude as the difference between rolls.
>
------------------
From: Tom Trottier, President, ACT Productions Inc.
infoanim@xxxxxx http://www.act.ca
+1 613 594-4829 fax +1 613 594-8944
199 Holmwood Ave, Ottawa, Ontario, Canada K1S 2P3
"Make it as simple as possible, but no simpler" - Einstein
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