All Nightfox binoculars have a manual focus. The lens must be focused using the focus wheel on the bottom of the device in order to get a sharp image.
If you own a Nightfox 110R, the image is focused by turning the lens itself at the front.
If you own either a Nightfox 110v or 120R, and you find that the focus wheel doesn't move, you can twist the lens at the front to focus the image and this will also loosen the focus wheel.
Please also ensure the infrared (IR) is on maximum brightness. There are seven brightness settings - repeatedly click the "IR" button located on the top of all Nightfox binoculars to go from level 1 to level 7.