Interesting....
(For optimum results and minimal reflections the bevel edges of the slit plates should be mounted away from the telescope, facing towards the collimator)
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before https://groups.yahoo.com/neo/groups/ast ... scopy/info "Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer