Well I downloaded the instruction manual of what looks like the Orion variant of the HEQ5 Pro (the sirius EQ-G) and there is no option listed to dim the polarscope. Another field trial (#2) was far more successful for me though and I took Mark's advice and left it all powered off and used a red torch. Way better result and with careful south and latitude alignment I actually could see the octanis asterism.
And lo! the gotos all worked brilliantly.
Much easier to setup than my 200R on a wedge.
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