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Reciprocity and intermittency effects in enlarging paper
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Nicholas O. Lindan  
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 More options May 4, 11:41 am
Newsgroups: rec.photo.darkroom
From: "Nicholas O. Lindan" <s...@sig.com>
Date: Sat, 3 May 2008 20:41:52 -0500
Local: Sun, May 4 2008 11:41 am
Subject: Reciprocity and intermittency effects in enlarging paper
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/appnotereciprocityandinterm...

The short synopsis is - there aren't any.

--
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  
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 More options May 5, 12:24 am
Newsgroups: rec.photo.darkroom
From: "Pico" <pico at idrailogid.ten>
Date: Sun, 4 May 2008 09:24:54 -0500
Local: Mon, May 5 2008 12:24 am
Subject: Re: Reciprocity and intermittency effects in enlarging paper

"Nicholas O. Lindan" <s...@sig.com> wrote in message
news:vL2dnaPdWcGUm4DVnZ2dnUVZ_quhnZ2d@earthlink.com...

> 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/appnotereciprocityandinterm...

> 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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