>>3509871This is the reciprocity table for HP5+. For exposures less than a few seconds, just use what your meter says, but for longer you should read off this chart.
For example if your meter reads 30s, look at 30s on the X-axis and see you should actually use ~90s as your exposure time. You have latitude with negative film so don't sweat getting it too exact, but if you blindly read the meter you'd underexpose by a stop and a half.
