View Full Version : Film Speeds of The Past

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07-16-2013, 10:56 PM
WOW! Thanks, Matt. I never looked for a manual before - although I have been on that site many times.

You are welcome.

I think I've been on Mike Butkus' site so often that I've memorized part of it.

07-16-2013, 11:05 PM
Well then I may have way under-exposed my verichrome pan 127 roll just now LOL shooting it at EI16 based on an assumed ASA of 64 (before the standard change).

~Stone | Sent w/ iPhone using Tapatalk

It depends on how old the film is. The speeds changed over time.

Also, don't confuse information about Verichrome with information about Verichrome Pan.

I expect the 127 Verichrome Pan I shot in the Brownie Starmite II I was given for my birthday in 1964 had an ASA of 64.

Photo Engineer
07-16-2013, 11:07 PM
Sorry, but I did not read all of these "expert" posts. The problem is that they don't take into account spectral sensitivity. So, you may make an ISO 40 emulsion that is color blind but might be ISO 100 if pan sensitized. Ortho changes the picture as well.


07-16-2013, 11:09 PM
Super XX was not rated at 200. It was rated at 100 Weston. I still have a little bit left and continue to use that speed. I don't bother to convert it to ISO/ASA because one of my meters is in Weston ratings. No, Weston ratings had nothing to do with Edward or his sons.

But isn't Weston 100 = ASA200 in today's standard?

~Stone | Sent w/ iPhone using Tapatalk