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I got a 5 mW one off ebay a while back for under $100. Great, as long as the moon is not about (I still use a RDF then; and I plan to get a more powerful laser when I can afford it). Good fun to boot. Naturally you've got to be careful if anyone is imaging, but there are a helluva lot of sessions when that isn't the case.
Despite reading about a lot of concerns and potential objections, I haven't found that anyone minds. In fact, I attach mine to my ETX, and the dobbers are grateful to use it to find those hard to get at DSOs. Also, I find that the beam is nearly invisible once you've stepped a few metres away from it. I don't think the neighbours would ever see it, and if you really don't like it all you have to do is move your scope a few feet away from whoever is using it.
I'd be interested to hear others experiences...
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