Reciprocity and intermittency effects in enlarging paper

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Nicholas O. Lindan - 04 May 2008 01:43 GMT

Previously noted elsewhere, but for those who don't read APUG or
the Pure Silver list ...

There is a new application note on reciprocity and intermittency
effects in enlarging paper on the Darkroom Automation web site.

http://www.darkroomautomation.com/support/appnotereciprocityandintermittency.pdf

The short synopsis is - there aren't any.

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Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http://www.darkroomautomation.com/index2.htm
n o lindan at ix dot netcom dot com

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Pico - 04 May 2008 15:24 GMT

> Previously noted elsewhere, but for those who don't read APUG or
> the Pure Silver list ...
[quoted text clipped - 5 lines]
>
> The short synopsis is - there aren't any.

That's a landmark study, for me anyway. I've read in so many places that
multiple exposures will not create the same exposure as the product of the
steps due to latency issues. I believed it. But something else was
happening. I attribute the product difference of many short steps to the
inconsistency of using a Time-O-Lite (which I had marked in F-Stops with
only modest success and some real inconvenience.) But now I have the
Darkroom Automation F-Stop timer. Very cool. Thanks again.

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