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Beamsplitter guiding -works for me
I modified a Meade OAG body to take a Surplus Shed 50/50 beamsplitter to allow guiding and alignment of the spectroscope slit... works well for me!!
I see that Vixen are selling ( about $100) a beamsplitter prism cube which would also do the job very well ( only available in 1 1/4" though).
A loss of 50% of the light is significant, but only represents less than a magnitude ( each magnitude step is x2.5 the brightness of the previous)
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