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I use an AZ 3 with my ed 80 for solar observing and I'm quite happy with. My only gripe is that there is no tension adjuster for slewing on the altitude pivot. It has a very simple and easy system for disengaging/engaging the azimuth, don't know why they couldn't for altitude. It's not a big issue, it just means keeping the nut on the altitude a little tighter than I'd like, making it a little stiff. Otherwise it's quite easy to use and stable.
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