>Winsor wrote:
>>>it is sort of like holding your hand
>above a flame. Your hand can absorb a lot of energy over a long time
>without burning it. You can even plunge your hand into the intensity of the
>flame for an instant without burning it, but if you put your hand close to
>the flame for a short while you will get a very good exposure. :-)<<
>
>Nice comparison Winsor, I've find in Michael Langsford excellent "Advanced
>Photography" (Focal Press) a very extensive explanation of reciprocity
>failure with another comparison:
>"Reciprocity law failure can perhaps be likened to filling a narrow necked
>bottle with water, in a very dry climate. If the volume of water is applied
>all at once, as from a bucket, much will fail even to enter the bottle. If
>on the other hand it is fed in drip by drip very slowly, a high proportion
>of water will be lost by evaporation. The optimum filling rate is the one by
>which all the water enters the bottle, but in a period short enough to
>minimize evaporation."
>Except this "watered" explanation the technical side is well detailed .
>regards
>marc
>
I like that one too.
Winsor
Winsor Crosby
Long Beach, California
mailto:wincros@xxxxxxxxxxx
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|