SVPRO 1080P USB Camera with CS Mount 5-50mm Lens, Manually Zoom in and Out, Gives Creative Controls for Close-ups Shooting at Long Distance
How to Use the Manual Lens:
1, Loosen the Set Screws on the Lens (no need screw driver)
2, Turning the Rings to adjust the focal length,aperturre and focus to your needs
3, Set back the screws to keep your adjustment.