f-stop printing means that you do not make a difference between film- and paper exposure THINKING. So your print is e.g. not 10s too light, but 1/2 f-stop. Your print will be 1/2 stop too light, no matter what mag-ratio, lens f-stop or mg-filter you apply. The translation to seconds is done by an "intelligent" device like an "f-stop-aware" lab-meter or stop-clock. In case of the RH-Analyzer, you can also "simulate" how different paper grades affect your print.