Quote:
Originally Posted by Terry B
Interestingly this is exactly what I do. I have 2 scopes side by side on the same mount. One has a spectrograph on it and I will guide on the slit using a STi at 1 or 2 sec exposures. This is fine for the spectrograph. Sometimes I will simultaneously image through the second scope for photometry. If the target is dim requiring long exposures I will use the AO unit to guide the photometry image usually with 0.2 -0.5 sec exposures depending on the filter. There is a bit of differential flexure between the 2 scopes and the AO corrects this very well. It would never have enough flexure to exceed the range of the AO unit.
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That's great - that means you have a true nested loop.
cheers
Allan