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Hi , I have 1 nvr - DS-7608NI-K1/8P, and 6 cam - DS-2CD2H83G0-IZS. 2.8 - 12mm , 8 MP Connected to 1 tv screen , when all the cameras are displayed on the tv , they look clear , but if i click on one camera and open the camera view large on the tv, the picture is blurry. Please help. Many...