I use zone system for my photography. I have 5 film backs, so my gear is ideal for full N-2,N-1,N,N+1,N+2 exposures. The 5 backs is OK in most situations, but sometimes extra weight (or space requirement) of 5 film backs is too much. What do you suggest on such situations? I have thought couple of options: Limit amount of film backs to only three (N-1,N,N+1) and if subject requires N-2 or N+2 (or more extreme), then I expose whole roll using that subject. That works, but cost bit more film. Limit amount of film backs even more, one back for N and one for other lightning conditions. Easy to carry, but again requires more film. Use of three backs, but not in traditional contrast. Instead N-1 1/2, N and N+1 1/2 backs. Then do some fine tuning of contrast during printing for N-1 1/2 and N+1 1/2 negatives.