I hope the OP doesn't mind me asking this question as I think the answer might be of general interest. It is certainly true that my Agfa film cassette packet quotes exactly the same dev time for both products. So is Studional merely a more highly concentrated solution and suitable for deep tanks simply because deep tanks require more solution which is easier packaged in a more concentrated form?

I wonder why Agfa and now the new company producing these developers still bother with two names and why Martin Reed at Silverprint doesn't simply stock the more concentrated of the two, namely Studional and then he could simply say that it can be used for small/daylight tanks as well as for deep tanks at different proportions?

Is having two names and two liquids simply an Agfa "marketing gimmick" which has been carried on for no better reason than to keep up the tradition?

pentaxuser