The IRE scale in the Pentax Digital spot meter spans 5 stops. Looking at the Den sity / Log exposure curves for Velvia, this film's log exposure in Lux seconds s pans only 2.5 decades. There must be a correlation between the IRE scale and the log exposure but I do not know how to connect the Fuji exposure data with the I RE scale.
Question 1) For example, I would like to know where IRE zone 10, IRE zone 1 a nd IRE zone 3.3 (midpoint, Kodak Grey Card)fit in the Fuji densitometric curves. Question 2) I understand that the IRE scale was developed to fit reversal films used in cinematography. Does any one know of any papers that explain the technic al criteria behind the IRE that explains its use?
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