Since the subject of exposure has come up agan, I'd like to mention that I've made an exposure calculator that you can print out and assemble into a dial like the one found on the Luna-Pro meter, except that it goes to f/2048, 8 hours, and ASA .375. It's available as postscript, gif, jpg, and pdf. It's on my web page at http://linux.bbn.com/~koolish just underneath the picture of the elliptical pinhole camera. You have to compute reciprocity failure yourself. The calculator does not do that.
