For tray, just begin by using fresh (one–shot) developers and agitate per manufacturer's recommendation, stack or tray rock. Personally, I've standardized all sheet development times with constant agitation. Most sheet films need to be exposed far greater than the manufacturer's film speed suggests for proper shadow resolution (i.e., HP5+, TXP @ 200, FP4+ @ 80-100, etc.). Film testing, per your development method, will help you in determining proper film speed for your particular application.
Originally Posted by Pfiltz
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