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definitely helps, but only in the best seeing. In general, I found that seeing was mostly poor when at low altitude, so there was not very much benefit from having an ADC to correct for the dispersion - the images were slightly less crap with an ADC, but still not good.
Over a year of Saturn and Jupiter imaging, the ADC was valuable on 2 occasions. However, if they have come down that far in cost, why not?
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