Celestron NIGHTSCAPE 8300 Manual Del Usuario página 13

figure 5: selecting the subframe area
6. Press the Start Imaging button again.
7. slowly focus until the FwHM (Full-width at Half-Maximum) value (in red) is as
low as possible in the Focus Image window. the star should appear as small
as possible and visibly sharper than when you began.
8. Hit Abort when done.
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12.