I just received a refurbished 5-20 4K pro. Focus was messed up at first. Like the front lens was loose, hard to explain, but I got that sorted out. Then when trying at night, with the stock whimpy illuminator, everything is all washed out, white! The only way I can get an image, is to point the illuminator off to the side. Very disappointed, and I simply hate trying to return something.

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