I may be talkin out my butt here, but i think Cabellas or Leupold ownes them.
sorry, lots of guys on here have a vast amount of knowledge of optics etc. i guess in this case im just not 1 of em. good luck tho, im sure youll find an answer talkin to someone on an LRH forum. (try optics LRH forum) on the main page, scroll down till you find it. Someone will undoubtedly know more about them than i do