I haven't tried Delta 100 in this combo, but it is my standard when processing HP5 or TriX. I dilute the FG7 1:15 and add approx. 1 teaspoon Sodium Sulfite, then process at approx. 15% longer than the recommended times for that dilution because I like my negs a little on the dense side.(posted 9693 days ago)I see no reason why this shouldn't work fine with Delta 100. Good luck!