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Hi,
Nice image.
which camera was it?
I'd suggest checking the collimation as I think it needs a minor tweak.
there is a method for collimating RC's using the secondary edge.
you can use a normal cheshire as well.
do work out the image scale of the guide combo vs the main scope and see if its not too far off.
phd uses sub pixel guiding, but seeing will be a major factor.
OAG would be the way to go but the guide cam will need to be very sensitive as the aperture of the main scope is not that large, so is the pixel on the qhy5l2.
with the rc8, an oag and lodestar is a proven solution as the lodestar has larger pixels than the L2.
Look forward to more results.
Cheers
Alistair
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