Even though there isnít anything specifically about flare in The Negative, itís still there if you know where to look. Appendix 2, Film Test Data, has a number of film curves from which itís possible to tease out some information. While the hash marks make it impossible to determine precise density ranges, the concept isnít lost.
TThe Negative - curve example.jpg
There is a seven stop range from Zone I to Zone VIII. The negative density range at Zone VIII from a density of 0.10 over Fb+f to where it crossed the film curve is approximately 1.20. The gradient of the curve is then 1.20 / 2.10 = 0.57.
In this example, there is no compression of the lower Zones and each Zone is placed along the log-H axis at equal 0.30 (one stop) intervals. Incorporating a one stop flare factor will reduce the exposure range from 2.10 logs to 1.80 logs. The filmís contrast gradient hasnít changed, but one value represents a negative density range resulting in a unrealistic non-flare situation, and the other represents a more realistic situation as all optical systems have flare. It also conforms to the middle of the paper LER range for a grade 2 paper, as well as information from Kodak and other publications.
Last edited by Stephen Benskin; 01-22-2012 at 02:15 PM. Click to view previous post history.