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Modified telescope.

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Maurice16/03/2019 17:30:54
431 forum posts
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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 Gilligan16/03/2019 19:32:03
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12782 forum posts
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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.

Maurice16/03/2019 22:30:26
431 forum posts
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Thank you Michael, that is exactly what I remember but with far more detail. Really interesting stuff .

Thanks again. Maurice

Neil Wyatt17/03/2019 09:17:14
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15705 forum posts
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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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