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extinction meter question

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a handful of years ago i bought an extinction meter from a fellow appugger
i found information about it, i used it a few times and i put it down and now
i want to use it again ... i can't find my notes and can't remember the conversion
factor between Scheiner speeds and current iso speeds ..
when i used the meter it was a nice alternative to sunny 16, ... if the day wasn't too overcast.

any historic meter buffs around ?

thanks in advance for your help !
 
Scheiner° - 11 = DIN°

(by approximation, both systems applied different ways to establish speed.)
 
Last edited by a moderator:
A quick search on the web will bring up charts comparing the various methods of establishing film speeds.
 
Just a big Fly in the ointment there were 2 Scheiner systems one in Europe the other in the US, US Scheiner 29 is 21 DIN or ISO 100, European Scheiner would be 22 - that's relative to the current ISO system.

I had an Agifold 6x6 Rangefinder camera with a built in Extinction meter and it was quite accurate, I still have a Practos Extinction meter that's marked for DIN, Scheiner (Europe) and ASA.

Ian
 
Jim Noel said:
A quick search on the web will bring up charts comparing the various methods of establishing film speeds.
Click to expand...

hi jim

i have been searching but coming up semi-unsuccessful.
http://www.film.project-consultant.net/html/asa_din_iso.html
and AgX says Scheiner -11 = DIN

so that would mean if i rate my photo paper at iso 12 ...
my DIN would be 12, and my Scheiner value would be 23 ?

i will probably just sunny 11 it and figure it out on the fly but i just want to have barely a clue ..

thanks
john
 
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