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I use
Kodak HC110 developer dilution B for eight and a half minutes at 75ºF.
That's the equivalent of 12 minutes at 68ºF. HC110 produces a little less
contrast and speed than D19. I like the developer because it is a liquid
syrup and is very easy to mix for one shot use. D19 is a powder and the
entire packet has to mixed so its' useful shelf life is less. Powdered
developers are also difficult to completely dissolve and the little left over
grains add to the clean up work on the negatives. The HC110 is just more
convenient for me to use. Michael Covington
has an excellent article on his web site and he also covers the topic in his
book, Astrophotography for the Amateur. The web address for the article
is:
Kirk
Carbo
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