>>3171419Long exposures are dummy proof. The difference between 5 minutes and 8 minutes is <1 stop. Get within a ballpark of the correct exposure and you'll be fine.
Step 1: learn EV values
Step 2: look up data chart if your film
Step 3: calculate exposure. No data for how to adjust for reciprocity? If we're talking minutes and c41 film, at least double your exposure
After 1-2 rolls if you haven't figured out how to adjust exposures for your given film yer just dum
