>if my F3 is over by 1/3, then I think my F90 must have been under by
>1/3. I have tried using Sensia 100, the most "accurate" one is the one
>with compensation of +1/3 on exposure.
>Are you judging by looking through the slides? What slides did u using
>during those test?

Once the two reference light values and reference camera are calibrated
(several films can be used - but may want to avoid Velvia, K200, E100 HC
and a few others that are unusual. K64, Fuji Sensia-Provia 100, Elite-
Lumiere 100, E200 Pro, some others are good) using reliable films and a
good light table (viewing against cloudy sky is o.k.), you can calibrate
any camera to the reference camera using the two light sources (assuming
the meters are linear!). Good luck!. David Ruether