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Maurice	16/03/2019 17:30:54
469 forum posts 50 photos	Many years ago, I considered grinding my own mirror for an astronomical telescope. I got a lot of books from the library, some of which covered telescopes in general .In of these was a refracting telescope that had a matte black cone positioned at the primary focus, with a base diameter dimensioned to obcsure the sun's disc and just project (or view with suitable filters) the corona. I am unable to find any reference to it now. Does anyone know of such a thing, and how well did it work please? Regards Maurice
Michael Gilligan	16/03/2019 19:32:03
23121 forum posts 1360 photos	This is only a very small step in the right direction, Maurice: Try looking for Coronagraph ... maybe starting here: LINK https://en.m.wikipedia.org/wiki/Bernard_Lyot MichaelG.
Maurice	16/03/2019 22:30:26
469 forum posts 50 photos	Thank you Michael, that is exactly what I remember but with far more detail. Really interesting stuff . Thanks again. Maurice
Neil Wyatt	17/03/2019 09:17:14
19226 forum posts 749 photos 86 articles	I'm sure you know, Maurice, but for anyone thinking of a quick experiment a reminder that any solarscope needs a proper solar filter or other device to prevent eye damage - the projection method being eth safets of all (and always cover up your finderscope!) Neil

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