AVer FD1020 user manual - Manual (Page 15)

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b. Use screws to secure the camera on the ceiling or the wall.
[Note] Do not lock it completely because you might need to adjus t the lens angle
later.
c. Unscrew the lens to adjust the angle.
d. After adjusting the lens,screw it tight. Repeat steps b and c as you need during the
whole process.