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Don't want to hijack this thread to a big discussion re ONAG! Do a bit of a search on this forum and there are some long threads. My own experience is mostly very positive, but "might" not be too great with a smallish refractor due to less IR light through the ONAG. That is, my TEC140 managed, but the TEC180 is clearly better. I'm going to try out the auto focusing soon but the software driving this technology is a bit limited at the moment forcing one to give up something to get something. I will post details once I try this.
Peter
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