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RE: no 85, reciprocity failure?
- To: multiple recipients of <telecine at alegria.com>
- Subject: RE: no 85, reciprocity failure?
- From: "Case, Dominic" <Dominic_Case at atlab.com.au>
- Date: Mon, 1 Feb 1999 10:13:54 +1100
- Resent-Date: Sun, 31 Jan 1999 17:12:52 -0600
- Resent-From: telecine at alegria.com
- Resent-Message-ID: <"AJ8D_B.A.9I.8MOt2" at sun>
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- Resent-To: multiple recipients of <telecine at alegria.com>
>On Jan 29, 7:34, Tom Nottingham wrote:
>} Subject: RE: [TIG] no 85, reciprocity failure?
I got Rob's reply to Tom's reply, but Tom's original never arrived here. So
I may be repeating what 's already been said but . . .
Reciprocity is to do with the effect of extremely long or short exposures -
like less than 1/000sec or over 1sec. Not an issue in cinematography except
in very high speed work. It's where the normal rule of "Exposure (and
therefore density) = Intensity x Time" breaks down, and it can affect
different colour layers differently.
But without a WR85, the blue layer of the neg is overexposed by about 2 1/2
stops compared with the red. The green is somewhere inbetween. Add in the
2/3 stop over that the DP added for good measure, and you have a severely
burnt blue layer. I'd fully expect some crossover as blue highlight contrast
would be flattened off - more or less depending on the contrast ratio in
email: cased at atlab.com.au
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