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    Procedure for avoiding eye damage
    From: Bill Lionheart
    Date: 2016 Mar 12, 01:15 -0800

    I worry I might make a mistake doing a sun sight and damage my eyes and I have not had anyone carefully explain the best procedure. When I did my RYA Yachtmaser Offshore course(in the 1980s) it was an evening course - so we saw lots of stars!  Here is what I usually do with my Davis.  Set the sextant to zero and put in all the filters.Point it at the sun. If the sun is toodim take out somefilters (but they are different colour so which first?). Bring the sun down to the horizon and maybe remove a another filter from the horizon if the reflected image is too dim.  As the Davis has a "full hirizon" mirror both the horizon and the sun are attenuated.

    Is that the right procedure? I have occasionally cautght a glimpse of the sun sneeking around the filters so my technique is still not quite right! Should I do anything different with an artificial horizon?

    So I just got a very nice Tamaya MS2L (636) which has a 7x35 monocular. This has, in addition to index and horizon filters, two filters built in to eye pieces for the monocular. One is polarized they other just very dark. How should I use these?

    Many thanks


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