Hi all there, I've just finished a small excel table with two flashes (but of course everyone can modify it as he wants) SB600 and METZ 58 AF1. You can find here the GN related BOTH to iso and focal lenght, plus the max distance covered by a certain GN. I also included all the commonest apertures and times in 1/3 and 1/2 steps, from -5 to +5 EV compared to a base couple value. If you are interested in or just to give a look, chime in! I don't know if I can post it, it's about a 30k .xls file. ps: for the ones still shooting film, I also included the 160 iso, typical of Kodak Portra and Fuji PRO S rolls.