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Hi Damian
I have an ED80 piggybacked on a Mak 150mm and like Marc I can use the scopes alternately as imager or guider. The setup works fine but I can make the following comments. I was disappointed with the performance on the QHY5 on the Mak 150mm until I;
- focal reduced the Mak150 to f6 to get a wider fov and brighter stars
- made sure I focused the QHY5 accurately
- use a dark frame facility (such as I can with my PHD guiding program)
Having done all this I now find that I can nearly always find good guiding stars within the fov of the Mak 150. Of course, the other way around using the ED80 as a guider works fine also.
Cheers Peter
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