Re: [APML] RE: Oh No! Kodak "Improves" Royal Gold

["Tim Hart" <Tim.Hart@haworth.com>]

I really like your rule-of-thumb formula...how did you come up with it?

Do you have a formula for other films.....?

Thanks
Tim

>>> roland@astrofoto.org 08/22/02 09:29AM >>>
>>>>> "Rick" == Rick Kellogg <rkellog1@twcny.rr.com> writes:
Snip...

For E200/Elite Chrome, I know have a rule-of-thumb for a good
exposure: T=2f(f+1), so at f/4 I get a 40 minute exposure.  Depending
on sky conditions, adjust +/-50% (really dark skies, you might go to
60 minutes, mediocre skies stop at 20 minutes).

roland



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