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  1. S

    Collimating 1960's/1970's Asahi Pentax binos

    I have bought "Porro Prism Binoculars Overhaul" and "A Concise Guide to Collimating and Restoring Vintage Binoculars", both by Alberto Roberts. You meant this author?
  2. S

    Collimating 1960's/1970's Asahi Pentax binos

    Yeah, you're probably right. There is no much wriggling space though for the prisms. They just fall into place, a plastic niche and are clamped down with springy metal straps.
  3. S

    Collimating 1960's/1970's Asahi Pentax binos

    Hi, So I have a few pairs now of those Asahi Pentax binoculars with yellow or gold tinted oculars. I had to clean 2 pairs inside. When you fit in the prisms they kind of fall into place, there's no options how to put them back. Then you brace them up with a piece of metal. Having put together...
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