Im talking amount of sky in arc seconds that fall onto one pixel... You generally want between 0.8 and 2 arc seconds per pixel. Anything less (ie - 3.35 arcsec per pixel as I was getting with my Orion SS Pro + TMB 80/480) and you will not capture fine detail. Not only that, but small stars may take up less space than one individual pixel, resulting in square or blocky stars... Smaller pixels = less sky per pixel = better sampling...
Your way of looking at it is very similar, and you are correct.. I just go by arcsec : pixel ratio rather than airy disk
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