I feel really silly asking this question. In the "old days" I would have just gone down to the local camera store and bought a 24 exposure roll of slide film, found a "typical" scene, metered with a calibrated meter, and shot one exposure at each shutter speed plus each lower and higher speed. With my "new" Leica Standard, that would be 7 different speeds for a total of 21 shots. And have it processed that day without mounting. Now, no local store sells or processes slide film. I have no idea which, if any, of my several light meters are accurate. (Shall I go by the apparently correct meters in my digital cameras?). Where to send it for processing that doesn't charge an arm and a leg? I have some 36 exposure Fujichrome Velvia 50 in my Freezer. I seem to recall that i used to expose it at ISO=40. Seems a shame to waste it making tests, but ordering ONE roll of film from B&H seems really silly -- the shipping would probably be more than the film. Your suggestions, please.