• Please use real names.

    Greetings to all who have registered to OPF and those guests taking a look around. Please use real names. Registrations with fictitious names will not be processed. REAL NAMES ONLY will be processed

    Firstname Lastname

    Register

    We are a courteous and supportive community. No need to hide behind an alia. If you have a genuine need for privacy/secrecy then let me know!
  • Welcome to the new site. Here's a thread about the update where you can post your feedback, ask questions or spot those nasty bugs!

russian lens

  1. Dr Klaus Schmitt

    A surprising find....

    Now this is a really, really rare lens: ZIKAR-1A, from the russian space defence program, to detect fired rockets aiming at the (then) USSR from about 45.000 km away, mounted at some camera system from a satellite in orbit around earth. It is a catadioptric system with two Beryllium mirrors...
Top