What ever method you decide on, the key is to think it through and understand the purpose, concepts, and variables.
Take a look at Ralph's Nomograph. Here are three questions to ask yourself.
Why is the aim negative density range for a "typical diffusion enlarger" 1.20 when the ISO standard has it as 1.05?
If you draw a line from paper CI 0.58 through 7 SBR to 0.58 adjusted aveGradient SBR (middle scale), through Normal Camera Lens Flare and you get 0.58 for the approximate final avgGradient. How is it possible to have the same CI from beginning to end when normal flare is at least a stop?
How can 0.58 be the aim average CI when flare is zero, yet CI 0.58 is also normal using a 1 1/3 stop flare factor: 1.05 / 2.2 - .40 = 0.58?
Last edited by Stephen Benskin; 07-16-2011 at 11:07 AM. Click to view previous post history.