I am testing my 'new' 13x18 pinhole camera......Hole 0.4 mm f=100 mm
Out in a nearby park I shot 6 films (Fomapan 100 iso)..... Sunny Day with lots of shadows .....after developing almost nothing on the film.......
I think I did not made any adjustments for Long Exposures.......

and where can I find something about reciprocity factors.......