Help With the Nightfox Corsac night vision binoculars

The Corsac 2 has a wheel at the front of the device on the left. Use the focus wheel at the front to bring the screen into focus.

The device has a lens cap for use in the day, it is likely to be in place, this blocks infrared and will prevent it working at night. To remove it you simply unplug it from the front left of the device. It is on a string for keeping it paired with the device.