Notes:
Exposure Value - input the value found in the subject/event tables (see links on left).
Film Speed (ISO) - input the new film speed to be used.
Focal Ratio - input the effective focal ratio of the optical system configuration.
Calculated EV at New ISO - this is the new effective exposure value.
Calculated Exposure Time - this is the calculated exposure time given in fractions of a second, decimal seconds, ans minutes.