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    Re: Mirror recoating
    From: Tony Oz
    Date: 2019 Mar 28, 05:03 -0700

    Dear Peter,

    You said:

    If the mirror is translated a little, that will not affect the rotational center of the index arm. It will waste a little light (if the movement results in some vignetting), but that's it.

    Though this is very counter-intuitive after lots of thinking I agree.

    The fact that one may swap a rear-side mirror for a front-side mirror (and vice versa) without any harm - is the Good Thing! Now I can order a front-side mirror with the SiO coating (like here) for my FREIBERGER. With a benefit of lesser light attenuation! I can ask them to put the reflective layer on both sides - for redundacy! If the frontal side gets badly scratched - I'll simply flip the mirror.

    Not sure if such swapping works for the horizon mirror though... With the rear-side reflection I get both the horizon and the body refracted, with the front-side mirror only the horizon refracts. Must think on it more.

    Thank you very much!

    Warm regards,

    60°N 30°E

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