I haven't got an HEQ5. Just a CGEM and a modded EQ5. So hopefully someone will chime in who knows about HEQ5s. If you don't get a response soon maybe post in the beginners astrophotography section - there's a few HEQ5 users there, and some use refractors and others newts.
I understand you concern about cost. You can get an imaging newt real cheap. I got my GSO here second hand.
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