without the iso setting in the camera
1. This camera has no DX contacts?
2. This is correct and logical:
High contrast scene --> need low contrast development --> lower dev time --> need to expose to lower ISO.
The reverse is without justification, and survives only as an Internet Truth, repeated over and over. Most modern films have a (very) large overexposure tolerance. A 400 b/w film exposed at 100ISO will be a bit dense, and have wonderful shadow detail. David Vestal, in The Craft of Photography
, shows detailed results of exposing Tri-X at successively lower ISO, down to 0.37 (Zero-Point-Thirty-Seven).