Judy Seigel (jseigel@panix.com)
Sat, 24 Jul 1999 01:23:18 -0400 (EDT)
On Fri, 23 Jul 1999, John Richardson wrote:
> I use 8 4' (40 watt) uncoated Sylvania type BL tubes. They are spaced
> just far enough apart so that I can get my fingers in between to change
> them. My negative is located approx 6 inches from the tubes. Average
> exposure times on HP5 plus are between 6 and 10 minutes with this
You don't say in which medium.... They aren't all the same.
My own experience, BTW, is that 3 inches is fine & twice as fast. We've
done so many threads on this I didn't repeat, but fact is it seems
practically impossible to get "hot spots" or banding with fluorescents.
As for the blacklight blue fluorescent bulbs (BLB) they're same as the
BLs, but with all but one wavelength cut out by the special glass --
making them about 1/3 slower, also (usually) more expensive. This, too, is
in the archive.
Judy
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| Judy Seigel, Editor >
| World Journal of Post-Factory Photography > "HOW-TO and WHY"
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