Hi, I recently found a working densitometer at a yard sale and I couldn't resist getting it.
I am familiar with the basics of testing film (EI established at Zone 1/.10 density units above film base + fog) and Normal development being established at Zone VIII with a density of 1.25 to 1.3 for my cold light head enlarger.
I am going to give HP5 a try for the first time and I thought this would be a good time to put the new densitometer to use.
In "theory" HP5 could be rated anywhere between EI 250 up to 3200. I was thinking there have been many times when I wish I would have had a couple extra stops because of wind, etc.
My question: If I rate my HP5 at EI 800, how would this impact my density measurements for development at Zone VIII? I know that I will have to develop longer when rating at EI 800, so should I try and attain the same 1.25 to 1.3 density but expect an increase in general contrast?
Thanks in advance.
Larry
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