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I just looked into a 20mW version from a "reputable" supplier vs eBay - roughly $300 shipped.
My 1mW ebay one is rather dim and unusable in the city, but definitely visible under dark skies.
I agree that the one being used on Stargazing Live was either a high powered one or definitely amplified by the fancy camera they were using - maybe a bit of both.
DT
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