viewing distance is dependent on video source. For 50inch tv optimum viewing distance:
SD 480p : 15feet
HD 720p/1080i : 10feet
HD 1080p : 7feet
Does that mean, 480p video source looks same picture clarity at full-hd tv and half-hd tv when viewed at the same distance.
I want optimum viewing distance for 42 inches tv.
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