0.64 µm - Red Band - 0.5 km resolution - Visible band 2 is in the red portion of the spectrum and has the highest resolution of any ABI band at 0.5 km, and for that reason is the primary visible band. It is used primarily to monitor the evolution of clouds throughout the daylight hours.
GOES-16 Band 2 corresponds approximately to the old GOES-13 visible channel.