latitude of HIE

["P.R.Goulden" <P.R.Goulden@xxxxxxxxx>]

Just in the process of getting my head round some of the info in Laurie 
White's 'Handbook'. 

It says that HIE has a latitude of 3 stops - is that to say that if you 
expose HIE on the straight line portion of its curve, a change in 
exposure of 1/3 stop will be equivalent to a change of 1 zone in density 
on the negative. That is are the ten zones spread over the 3 stops of 
latitude ?

Or does it work differently ?

Trying to eliminate the 'chance' factor - and suddenly felling out of my 
depth !

Paul
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