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even with mono, it is still worth having an ADC at low altitude, particularly for the blue channel. I have one and use it because I have it, but the performance gain is almost always marginal due to poor seeing at low altitude - it only made a real difference on two sessions over the past couple of years.
another issue is that they are not all that easy to set up on a Newtonian scope - I guess that it would be a simpler procedure on an SCT.
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