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    Re: Home made FSM for AH or idx-mirror
    From: Igor S.
    Date: 2019 Sep 30, 05:02 -0700
    Fred,
    You are right. I had no control over this parameter but assuming that all modern glass is a float glass quality I can also assume it is flat enough for this particular application. The square 6mm mirror in the photo's have already been tested. Using my exact coordinates as a DR position I've got systematically small intercept amplitudes (less than 1' ) upon leveling it with precision vials. Same results were obtained with an optical grade FSM which I used as a reference.
    I can judge home made FSM only on basis of final (systematic) results.
    kind regards,
    Igor
    Re: Home made FSM for AH or idx-mirror
    From: Fred Hebard
    Date: 2019 Sep 29, 12:30 -0400
    flatness of the mirror is important, and may be a factor with some inexpensive ones.
    Fred Hebard
       
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