Johnmcd
Well-known
It is not that easy to test a film for ISO if you don't own a transmission densitometer, and it is even likely that you prefer the results at 200 to those at 160 even though a proper test would give it a 160. Many films perform quite well when under- or overexposed, some even better than at box speed. For example no ultra-fast film ever got past a proper ISO 1000-1200, but they are (or were) labelled and marketed for their one or two stop underexposed speed.
Thanks. I will experiment and see what I like best.
Cheers - John


