Hello guys.
I am trying to learn the Zone System and have stumbled upon two obstacles:
- I do not have a spotmeter (only a Gossen ambient meter)
- I only use roll film (135,120)
Is it possible to use the ZS with such a set up?
All books I've read, including Adam's Negative assume that you have a spotmeter
and can also adjust the developing of image by will.

Thanks,