Lee is right. The time means nothing really. I mean, if you are using ASA of .01 that might be a 30 minute exposure in bright sunlight...
Originally Posted by Lee L
So like he says, you need to look for a meter with the lowest EV. The silicon-blue meter in my Canon EF (FD body) goes to EV -3 I believe, which is enough to accurately read a full-moon lit landscape.
However Lee, I'm not sure what you mean exactly by extending time involves a compounding effect. If you are metering 30 minutes exposure, you of course need to apply reciprocity failure compensation, but this new & longer time requires no further compensation (compounding). Right?