Celestron NIGHTSCAPE 8300 Manuel D'instructions page 13

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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.