Bert
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There is just no room in the image train for an OAG.
I could drill into the rear bit of the Atlas focuser and install a small prism.
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What about if you uninstall the filter wheel?
Then you would have enough backfocus to run an OAG -
remember this is just for a test to eliminate differential flexure.
But:
The RH200 should have plenty of backfocus:
http://www.teleskop-express.de/shop/...strograph.html
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The focuser provides 70mm of backfocus which is enough for most cameras, filterwheels, OAG and even AO
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