Well, is it? I'm new to the Zone system (I used to just bracket and choose the best exposure), but I want to delve into it and master it properly. I can't afford a spotmeter at the moment, but I do have a Sekonic L328 digital meter (I'm looking into getting the 5 degree spot attachment for it. By the way, is 5 degrees enough?). Also, I've got a Hasselblad 500CM with only one film back. Should I have 3 backs in order to fully take advantage of development control or can I get away with just one?

Thanks in advance. I can always count on you guys and gals for the best advice.