Here's an example I have. The shadow on the dead tree was placed on Zone IV, the sunlit highights fell on Zone IX, I gave N-1 development to TMX with d-76 1:1. A 23A red-orange filter was used, the basic exposure was determined at 4 sec at f/64, accounting for the filter factor it was adjusted to 10 sec at f/64, finally accounting for reciprocity, the final exposure was 25 sec at f/64.
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