I suspect that even if there were no EXIF data in the file whatsoever, the possibility that you'd get anything even remotely resembling identical data in two jpegs of an identical subject taken on a tripod with the same settings and identical lighting a few seconds apart, would approach nil. I think the compression probably introduces some kind of randomizing element. I bet this would be true even if the 'subject' were nothing but a brief exposure with the lens cap on and the only difference was sensor noise.
--Ken S. > Assuming that this data (if it exists) is somewhere in > the EXIF header, I > wonder if it might be possible to discover the existence of > such by taking truly > identical images and then examining their jpeg files using a > DOS file compare > utility. Assuming that differences other than the ordinary > file number show up, > use of a hex editor might show where the data is stored, and > whether coded or > not. * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
