Okay, thank you Ruediger!
Which films you guys recommend to be used with pinhole cameras? I've been thinking of T-Max 100 in addition to FP4+ and Fomapan 100. In color I've been using for example Fuji Reala 100 and Kodak Portra 160VC with 120 (and 135) cameras. Do these all work (if the reciprocity failure is compensated with extended exposure time)? How about a slower film, like Rollei Pan 25?