second focal plane

  1. First Focal Plane or Second Focal Plane?

    (Forgive me if this has been asked before, I couldn't find the topic) Hi all, I'm quite unfamiliar with the world of optics, being new. Currently, I haven't been on a stalk yet (Booked one in the new year), I'm researching into equipment and getting more familiarized with what I should look...

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