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I did some perfectly acceptable prime focus DSO work on the LX90 without a wedge, using 30 second exposures and stacking. You could probably get away without counterweights and only have to throw out about half of the shots.
The LX90 will get you there, but it is really designed as a visual scope. Also, keep in mind that putting the counterweights on adds less than a minute to your setup time, and only about 10 seconds if you leave the dovetail on.
Eric
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