Hi: Thought more about this. There may be enough light for a pinhole scanner camera if its used outside - Somebody run their scanner in the dark and take a meter reading and see how much light it likes to use. If a pinhole used outside (or inside with enough illumination) to create this lighting level it might work.
Most of the scanners that take a transparency adapter have some way of turning off the interior lamp. You would fool the scanner into thinking it was scanning a transparecy but it would be taking a real iamge. The exposure time would be controlled by the speed of the ccd element travels across the image in much the same way that exposure is controlled in a circuit camera. The scanner software may to this - the transparency adapters do not vary their output. The scanner must have some way of dealing with the different densities of transparencies. Another way of making images would be for the ccd element to move toward or away from the pinhole - the focal length of the image would change as the ccd travels accross the image plane. It would make a variable anamorph image. That would look interesting. If its possible to control the rate that the ccd unit travels across the scanner, or if its possible "to give" the scanner the lighting level it expects it may be possible to make a scanner camera. The latter could be done by selecting an appropriate pinhole size if its bright enough outside But the rest of my ideas - altering the ccd travel and axis, this is very much un-pinhole like - not simple or easy. I think it would need a programmer and an electronics hardware specialist to pull this off. But it would make some fascinating images :) Gord On Wed, 19 Jun 2002, Scott Walker wrote: > Actually, if you think about it, it is not such an out-there idea. most of > the first phase digital backs for 4x5's where scan back. The only reason a > flat bed scanner emits light is so that it can scan the image inside a dark > box. The actual ccd does emit any light itself. I've thought about > experimenting with scanner back, but i don't have 10k to by a 4x5 scan back > and i highly doubt the school would let me disassemble thiers. > > Scott Walker > > > > > Sorry everyone, but this sounds NUTTY! How would you 'expose' for a long > > enough period of time related to a pinhole exposure?! I think you'll > > just get an out of focus scan of the inside of your 'pinhole box'. It's > > the sanner that is projecting light out, not absorbing it like film. > > > > We do have good imaginations, though don't we, on this list;) > > > > Andrew > > > > > _______________________________________________ > Post to the list as PLAIN TEXT only - no HTML > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??????? > unsubscribe or change your account at > http://www.???????/discussion/ > --------------------------------------------------------- Gordon J. Holtslander Dept. of Biology hol...@duke.usask.ca 112 Science Place http://duke.usask.ca/~holtsg University of Saskatchewan Tel (306) 966-4433 Saskatoon, Saskatchewan Fax (306) 966-4461 Canada S7N 5E2 ---------------------------------------------------------
