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Hi ezystyles, I have both a 2x and a 3x barlow, and as Steve suggests if they are of equivalent quality both give equally good images - at least at the same magnification. If you use the same eyepiece in both then you will get a much higher magnification in the 3x barlow and consequently will suffer more from poor seeing, objects will also appear fainter and more washed out just as if you used a much shorter focal length eyepiece.
cheers,
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