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I've taken an extract from "Astronomical Spectroscopy for Amateurs" which details the mods to the Vixen guider.
The beamsplitter plates are available from Edmund Optics etc. Unfortunately not always from Surplus Shed.
A microscope slide can be used to give a 90/4 beamsplitter.
I have some bits' and pieces left over in the "box" - if any member has a specific need - Vixen body, beamsplitters etc let me know.
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