Cheap chinese junk

I can't imagine how anybody would give this thing a 5 star review, it was terrible. Even at the lowest resolution setting the refresh rate of the video is about every three seconds. It's very fiddly to get the picture to focus and having to weight a few seconds after each adjustment makes for a very long and frustrating process. If you increase the resolution of the picture the refresh rate lengthens exponentially. I'm guessing that every previous reviewer was paid by the company to write each glowing review. I disagree totally with all of them. I returning this cheap chinese junk.

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