QHYCCD QHY8L - Manual (Page 15)

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Click the Live Preview option. This lets you
achieve a continuous preview. We recommend
select the shorter exposure time (100-500ms) for
obtaining faster preview speeds.
Adjust the lens or the telescope focus and get the
a shape image.
Stop Live Preview
Select a good star point or target in the image
area using the left click of the mouse.
Open the FOCUS column. Click the FOCUS
button to get a focus image.
Adjust Histogram of gray column to choose the
appropriate range.
Click Live Focus option again. Click the area of
image to get a more precise target. At this point, it
will show the analytic curve in the Screen View
column and a 5x zoom focus image. While it’s
exposing, the FWHM column will show the width
of stars and the intensity of the star point peak.
Generally, smaller FWHM and bigger peak
intensity indicate the better focus. 8
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When you finish Focusing, open the Capture
column and start shooting.
Set the appropriate value of Gain, Offset and
exposure time
Select 1x1 Binning mode, select the low read-out
speed. Click Capture to shoot.