Ray007 on 11 January 2008
A nice and informative thread CrashMan, though I think the numbers for human resolution are a bit inflated. Have you ever met someone that can resolve 0.3 minutes of arc?
I think the accepted norm is 1 min of arc, also referred to as 20/20 vision. Most people should reach this level of acuity with adequate correction (if required). Based on this and your calculations for viewing angles, the numbers should be:
28" = 1155 x 654
32" = 1316 x 747
37" = 1515 x 862
42" = 1712 x 977
52" = 2097 x 1205
62" = 2469 x 1431
This is probably why it's also said that 1080p is pointless until you get to about 50". Now, a lot of people have better than 20/20 acuity (including myself 
) and can resolve more than the values above - but most people wouldn't.
