Thanks to all who replied to my mail. This whole thing will obviously not work the way I thought. Okay, I decided what to do no. I will take one of my Zeros, leave the 4x5" at home and take some extra shots if not sure of the exposure time.
Regards Dieter -- Dieters Lochkamera Seite: http://www.die-lochkamera.de/ drf-Süd-Homepage: http://www.drf-sued.de/