Temi, I never succeeded in finding a safe formula for my multiple pinholes cameras : there are really a lot of variables which influence the exposure . The major ones seem to be : - 1) the way you use multiple pinhole : opening /closing the various pinholes simultaneously or not. The sum of x exposures has not the same effect than a x time unique exposure - 2) the disposal of your pinholes and the degree of overlapping picture they generate. This determinates the fall off which occurs on the outer limits of the image formed by each pinhole.
So, depending on the plans of your camera and the relative size of pinholes (if they are different), you will have to try to evaluate the way the light will hit your film or paper on the other side. As a rule, I generally give my preference to overexposure when I start searching the right exposure because, in pinhole photography we are very more often risking underexposure than overexposure. In practical conditions, if you have a multiple pinhole camera with only 2 normally sized pinholes spaced so that the overlapping zone is narrow, starting by determining exposure for 1 pinhole and using it for a simultaneous use of the 2 pinholes gets you very close to the right exposure... But if you try a 30 pinholes camera with a match box, then, you will have to take in account the total quantity of light (cumulative exposures) hitting your film or paper ! I wish you good experiments ! Jean ----- Original Message ----- From: "Temi" <t...@temioriginals.com> To: <pinhole-discussion@p at ???????> Cc: "Temi" <t...@temioriginals.com> Sent: Sunday, March 25, 2001 12:00 PM Subject: [pinhole-discussion] Multiple Pinholes What is the best way to figure the approx time when using more than one pinhole. There are a lot of variables as to placement of pinholes and sizes, etc., but what is a good starting point to experiment. Would it be best to come up with a total opening and figure time from this or to figure time for one pinhole and then divide this by the number of pinholes used. _______________________________________________ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??????? unsubscribe or change your account at http://www.p at ???????/discussion/
