----- Original Message -----
From: "Shel Belinkoff" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: April 7, 2001 9:25 AM
Subject: Re: OT: Theater photo & film choice (Brian's ramblings)
> Brian wrote:
>
> > I have been using Fuji NHGII-800, pushed
> > either 1 or 2 stops ...
> > whenever I shoot C41 film that has to be
> > pushed, I usually try to give it at least a third of a stop
> > more light than I rate it for, ie.Shoot at 2500 and process
at
> > 3200 etc.
>
> OK, please explain something to me. If, as Bill and Aaron,
our
> resident processing gurus say, C41 is not pushable, but,
rather, is
> a develop to completion process, how do you "push" Fuji NGH
one or
> two stops. What is your technique for processing it at 3200,
etc.?
We've been down this road a couple of times, now. Here we go
again. Colour negative film has several stops of exposure
latitude. If you underexpose it, but the important shadow detail
is still imbedded on the emulsion, you will have a relatively
acceptable print.
What you get whenever you underexpose/overdevelop is a decrease
in shadow detail, with an increase in contrast. With C-41, as
you increase development, you also increase the mask (thats what
we call that orange coloured base) density.
What does happen with over developed C-41 film is that shadow
and midtone values do move up the exposure scale somewhat more
than highlight values, thereby increasing the amount of dye that
is formed around those exposure values. This does increase
relative saturation, and may give an appearance of a speed
increase.
Unfortunately, the film's speed point is measured at it's
threshold exposure value, and this is immutable. No increase in
processing time will alter that value.
William Robb
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