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Thanks for all your comments, Ken it's a reverse mounted 11/4"star diagonal mounted in a collimated cell inside an aluminum box made from two pieces of angle bolted together. Which I then bored out on my lathe. the back is open with a diffuser made from a heatsink that has been also bored out back to the vanes, and painted black to stop any reflections going back into the prism. As its for imaging only, I use a variable polarizing filter to further cut down the light . I image at .6ms at unity gain on my ASI120mm camera. I also use an IRcut and solar continuum filter.
Martin
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