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On something silly - like getting Hubble views from the dime store scope -well its easy to present factual information - its not diffraction limited optics, its not colour corrected and the mount might just wobble a bit - quality clone binoculars and visit a star party type suggestions.
On a dangerous products - variable quality sun filters , megawatt lasers etc - point out the risk categories and exposures if these products were to fail, and query whether the brand in question has a sterling reputation.
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