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Peter the standard SCT type FF/FR (F3.3 and F6.3) do not work well with the RCX/ACF type scopes as they are trying to correct for what is not there. The AP CCDT67 works OK as a FF/FR. See Freds (Bassnuts) site for what can be done with this unit. I have one but have not used it yet as am too busy playing with refractors.
Mark
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