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    Re: Which Baader Solarfilter for Ebbco sextant
    From: Geoffrey Kolbe
    Date: 2016 Mar 27, 13:18 +0100


    On 27 March 2016 at 10:28, Herman Dekker <NoReply_Dekker@fer3.com> wrote:

    The filters on a Ebbco sextant has become useless.
    I want to replace them with Baader Solarfilter.

    In The Netherlands I can buy two different foil types on A4 format.

    ND 3,8  the LT (Light transmission) = 1/1000


    ​Actually, ND 3.8 is about 1/6,800​
     

    ND 5,0  the LT = 1/100000

    ​This is what you would need as a stand alone filter when looking at the full sun, though in cloudy or misty conditions it may be too much.

    Since the Ebbco has three filters for the index mirror and two filters for the horizon mirror, I would put one of each in both the index and horizon filter set.

    Geoffrey Kolbe​
     


    --
    Dr Geoffrey Kolbe, Riccarton Farm, Newcastleton, Scotland, TD9 0SN
    Tel: 013873 76715
    Mob: 0773 8069 663
       
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