Homepage › Forums › General Photography › Film Photography › exposure timer This topic is empty. exposure timer eunified61Participant July 23, 2009 at 6:46 pm have got a Wallner automatic s it has a paper sensitivity dial and something that looks like a photocell with a little shutter, I think a combination a the dial and cell determines exposure can anyone tell me exactly how Viewing 1 post (of 1 total) You must be logged in to reply to this topic.