This will help the folks that have many questions:
720×480 : D-VHS, DVD, miniDV, Digital8, Digital Betacam
720×480 : Widescreen DVD (anamorphic)
1280×720 : D-VHS, HD DVD, Blu-ray, HDV (miniDV)
1440×1080 : HDV (miniDV)
1920×1080 : HDV (miniDV), AVCHD, HD DVD, Blu-ray, HDCAM SR
1998x1080 : 2K Flat (1.85:1)
2048×1080 : 2K Digital Cinema
4096×2160 : 4K Digital Cinema
7680×4320 : UHDTV (8K)
15360x8640 : 16K Digital Cinema
4K is about the same as 35mm film and 8K is about the same as 65/70mm film.
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