Sudek buy a couple of 31 step tablets (from Stouffer - the T3110 variant - or PDN, I personally find the latter is better for our specific requirements...) and cover half of the tablet with the transparency material so that each step is half covered, and test again until you get at least two steps merged under the tablet + transparency, your standard exposure will be 1/3 stop less than what is needed to merge two steps under the tablet + transparency. (Because the test material UV density is about 1/3 stop ...) Standard Pictorico needs at least 2/3 stop more exposure IME. Therefore if you're getting black in 6 minutes w/o the negative material, you'll need *at least* 6 x ( 2 ^ (2 / 3)) ~= 9,5 minutes with Pictorico. (Probably a little more, I think Ultra is more opaque to UV...)
Last edited by Loris Medici; 09-15-2013 at 05:45 PM. Click to view previous post history.