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Flip slider +OAG
I've got a Chinese? "flip" mirror system ( I think I actually got it from HOugy), interesting arrangement.
It has a 1.25 elliptical mirror on a slide which can either act as a "flip" mirror or semi-retracted to allow it to be used as an OAG with the advantage that the mirror can be as far in (or out) as necessary. Simple but very effective.
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