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Andrew
There are lots of issues useing an A07 that may cause grief despite the bonus eliminating PE effects.
Having said that, when its working well, its a wonder to behold !, an awesome machine.
To use it, you need an SBIG cam (internal guiding).
As they can work up at to 40hz, they can hide a lot of bad PE at that frequency, not sure about 50 arcsecs, but my G11 mount at the time I tried had at least 15-20 arcsec PE (just out of the box, no tweaking, and overloaded to hell) and it creamed that. It will also nudge the mount as in normal guiding if the guide star gets too close to the edge.
The downside is of course you need a VERY bright star to get anything like 40hz, that is exteremely hard to find. I found with a clear filter you were lucky to get much faster than 0.5 secs (well, without constantly rotating the cam to find a better one, which is a real pain without an instrument rotator).
Operating through filters, I found I was back to 1 to 2 sec guiding exposures too often, which gives you no advantage (or dealing with PE) over normal guiding.
If your really hard core, or simply cant get PE down on your mount to get really tight subs, then an A07 really is the bomb, no dought, but its a mongrel to use, and you have to be very patient to it set up.
I gave up, cant hack it. I just kept trying to reduce PE, Pempro is very good to generate PEC, consider that too.
Cheers
Fred
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