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I have both, an RDF on my refractor and a telrad on the reflector. Performance-wise they are much the same. The big advantage of the RDF is its stability. I take it on and off the scope and have only adjusted it once in 3 years. However, that's also since the main scope is a refractor. With a reflector you'd have to adjust every time you recollimate and the RDF's usually need an allen key to do this. So, IMO
*RDF with a refractor
*Telrad with a reflector.
Geoff
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