so shooting pan paper as direct reversal also reverses (mirror image) the image like positive weplates. There were olde photostat machines with reversing prisms, but they seem to not be able to be used with anything but shallow view angles--they would not work for wider angles of view. The only mirror boxes available seem to be of the tiny 2" variety for telescopes. There are large teleprompter setups that look like they may work if the beamsplitter is replaced with a regular 1st surface mirror. There are DIY instructions for mounting powerful binoculars with 1st surface mirrors to look at the stars. Is there anything else out there that anyone's aware of that would work. gettting a nice store-bought precise item is preferable to cobbling together some heavy oversized wood contraption. Or is there another word to search--"mirrorbox" only gets the telescope tiny ones and the diy binocular setups.