I have a pile of 8x10 E64T that I want to shoot long night exposures with, my understanding is that it is superbly corrected for reciprocity - even so surely it suffers at some point? Does anyone know of any details beyond the 100s timing shown on the box?

Given that most of the subjects will be very poorly lit, but what is the best strategy for metering? I only have an incident meter (plus spot in a DSLR), should I meter at the brighter subjects in the scene and place them accordingly using Zone? I may have limited access to the scene I'm shooting so might not be able to work this way.

I'll be shooting mainly in the urban environment.