12 feet from a ~100" screen, so more or less 6' from a 50".

Watching TV at traditional SD viewing distances was more like reading a book; the image provided a general idea and your mind filled in the details ;\)

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8