Paul Howell
Subscriber
I agree, in terms of just testing film, all you need to shoot at box speed, then bracket a set of scenes, bright daylight, open shade, deep shade if flash user then flash. Develop to manufactures recommended time for your film then made a contact print or scan to determine which shots give both shadow and highlights and that becomes your personal ISO for that camera. My newer cameras with electronic shutters and matrix metering shoot very close to box speed, Foma 400 at 320 Tmax 400 at 400. With my older mechanical cameras with average TTL metering, all over the map. Konica T3, Foma 400 200, Tmax 320, Konica T, Foma 400 800, Tmax 800, Not a fault of the film or developer just aging cameras and meters.Yes I found that book to be a pretty good text on what to do and why to do it but as Doremus says "the reduce film speed by 1/2 to 2/3rd stop and reduce development time by 15-20%" maxim probably gets you very close
pentaxuser