Got these two matching oddball 45 degree prism diagonals a while back, can't seem to find any info on them via an internet search. I posted about these here on CN some time back but can't seem to find it now.
The designations on them are what look to be an image of a Kiwi (as in the New Zealand bird) and "ATM".
The 'oddball' part is the image through a common achromat refractor is correct left/right but upside down. Every 45 degree diagonal prism I've run across is correct left/right and right side up. What would be the application for this design?
Anyone know anything about these?