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Jorge Gasteazoro |
19:13 13 Feb 04 |
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Jon J. |
17:36 13 Oct 03 |
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Phil Davis |
7:02 14 Oct 03 |
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Jon J. |
9:33 14 Oct 03 |
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Re: UV-VIS spectrophotometer as a tranmission densitometer? |
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Chris Gittins |
18:21 18 Oct 03 |
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Jon,
Densitometers typically measure average transmission between 400 nm and 700 nm. Not all wavelengths are weighted precisely the same amount and there's a little contribution from outside that band, but to dwell on those facts would miss the forest for the trees. Take the average between 400 and 700 nm.
I'd expect that transmission is relatively flat until you get down to wavelengths at which the film starts to absorb. My semi-educated guess is that's below 350 nm. Most glass starts to absorb not too far below 400 nm, so the characteristics of the negative at shorter wavelengths may be a moot point once you get the negative into your enlarger. (I don't know for certain, but I'm guessing most enlarger lenses aren't made of UV grade fused silica.)
Best regards,
Chris Gittins
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bg |
22:12 22 Sep 03 |
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Phil Davis |
17:38 23 Sep 03 |
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Angelo Micheletti |
8:21 5 Sep 03 |
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Phil |
10:36 5 Sep 03 |
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Angelo Micheletti |
10:42 5 Sep 03 |
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