<<<<so a variation of thickness great enough to cause focusing problems would be likely to infuriate the processing people, and would be noted by the photo magazines, and would kill or seriously maim sales>>> I don't know what to tell you....there was a very clear and important difference in the scan results dependent on which way the emulsion faced. The tech support person said it was based on the way the light reflected from the thicker Fuji emulsion and 'fooled' the scanner focusing. It was clearly being explained in 'layman's terms' so I certainly can't explain the science behind it. Howard HMSDOC@aol.com - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.