Learn To Live With The Variables
Most people are vaguely aware
that shutter speeds aren't always as fast as they are marked,
that ISO speeds can vary, and that overall, photography isn't
that precise a science. What they often don't know is just how
far-out things can be.
But speed increasing developers
such as Ilford's own Microphen or DD-X or Paterson's excellent
FX-50 can give ISO 650, still meeting ISO criteria for shadow detail and
contrast, and a fine-grained developer can easily drop the speed to ISO
200. Some manufacturers use speed increasing developers for ISO tests--Fomapan's
excellent ISO 200 film is 160 or even 125 in Kodak D-76--but (unsurprisingly)
none use speed reducing developers.
The Sum Of The Parts
How It All Cancels
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