From: Sandy King (email@example.com)
Date: 04/27/00-11:32:46 AM Z
This is very interesting and something I had previously not
understood, though I was intuitively aware of the effect from
practice in dealing with changes of distance in the 2-5 inch range.
However, since the inverse square law does not apply, what does?
Would I be safe to assume the same exposure with a bank of 8 - 4 foot
bulbs at 2 inches from negative as with the bulbs at 8 inches, or
12-20 inches from the negative
>The inverse square law applies to point sources only. Once you are
>fairly close to an extended source (such as your bank of 8 - 4 foot
>bulbs) the inverse square law breaks down completely, and your
>observation is absolutely correct - there is no change in intensity
>with a change in distance.
>Chicago Albumen Works
>[No#] Front Street
>Housatonic, MA 01236
This archive was generated by hypermail 2b29 : 06/13/00-03:09:50 PM Z CST