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The Andrews binoviewers say they are multi-coated BAK4 prisms (pg 35, Australian Sky & Telescope May 2006)
Janokiss,
Thanks for telling me first! How much "clear aperature" (?) do you need to fully illuminate the full field of a 22mm LVW? Could you please explain this in laymans terms a bit more fully for me. How much field of view will you lose from the 65 degree FOV?
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