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Thanks for that link to Bert's thread. After reading that and some of the others I have found on other forums, I have decided to go ahead with project and decided on the Bresser AR-152S, (f5, 760mm fl) it has been ordered from Teleskop-Express. It has a four element lense set, the traditional achro doublet and a superachromatic-like correction group, the chromatic aberration is reduced (supposedly), but of course not much of a concern with narrowband imaging other than assisting filter refocus perhaps.
I need to source a field flattener that will work with this scope (f5, and 760mm fl), which is just outside the Orion Flattener specs but maybe it would be ok. Anyone with a Field Flattener suggestion for this scope please let me know.
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