Quote Originally Posted by jeztastic View Post
Ah, this is useful information. This may have been the problem.
I recommend you get a copy of Way Beyond Monochrome 2nd Ed. It's like an encyclopedia, well worth the money.

http://www.amazon.com/Way-Beyond-Mon...ond+monochrome

In it you'll see how to determine your own exposure factors for changing contrast from one filter to another for the paper and developer of your choice. Example is given for keying on Zone VIII, reflection density = .09 (.04 above base+fog).