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Good luck with your quest Jonathon, I think you will have to import one.
I have tried this technique before using a small 8 x 6 inch bathroom mirror. I just leaned the mirror against the Obs wall while I sat on a bench looking downwards. Focus was hard to achieve and the astigmatism was woeful. One other thing is don't use too small a mirror or only one half of the binos will show your object, unless its dead centre of the mirror.
Given what I said about the astigmatism go for the best optical grade you can afford, you really need the mirror to be optically flat.
Cheers
Bill
P.S. I just noticed this was your first post, welcome to IIS Jonathon, let us know how you go with the project, it could help others wanting to do the same.
Last edited by billdan; 13-12-2016 at 02:22 AM.
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