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kodak B/W Print positive 7302 - ASA?


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#1 Richard Tuohy

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Posted 08 September 2005 - 07:41 PM

G'day,
I want to try some experiments with using Kodak's BW print stock (7302) as a high contrast (and very slow!) camera stock. I have heard ASA ratings from 3 to 12. Actually, one thing I want to do is cross process the stock as a reversal which would efectively double the asa. Kodak don't seem to have the asa of this stock listed on their web site.
Anyone help?
Richard T.
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#2 John Pytlak RIP

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Posted 08 September 2005 - 09:03 PM

G'day,
I want to try some experiments with using Kodak's BW print stock (7302) as a high contrast (and very slow!) camera stock.  I have heard ASA ratings from 3 to 12.  Actually, one thing I want to do is cross process the stock as a reversal which would efectively double the asa.  Kodak don't seem to have the asa of this stock listed on their web site.
Anyone help?
Richard T.

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Speed ratings (EI) are only applied to camera stocks.

Although Kodak publishes sensitometric data for all its motion picture films, it's hard to compare a blue-only sensitive stock like 7302 with a panchromatic camera stock. With a non-standard reversal process, you are on your own.

I'd suggest starting at EI 3, and run a wide exposure series to narrow down the speed for your conditions.
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#3 Richard Tuohy

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Posted 08 September 2005 - 09:40 PM

Thanks for that John,
I see. I realised it was not panchromatic, but that explains why no asa! I will have to do tests.
R.P.T.
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#4 Dominic Case

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Posted 08 September 2005 - 10:00 PM

I will have to do tests.

Oh yes, you certainly will. That's the joy of playing with non-standard stocks and processes.

With normal processing, B/W print stock has a gamma about 4 times that of B/W negative, and consequently, is very exposure-critical. Half a stop either way will make a massive difference to the image, as the stock can record a brightness range of only 3 or 4 stops (depending what gamma you process to).

If you want more than blue-only sensitivity, you might try panchromatic sound negative stock 2374. Beware - it's polyester based.
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