First, you should firmly fix the binoculars to a tripod. You can do this with duct tape (what else?). Now,cut out a shield made of cardboard and tape it to the front of the binoculars with the lenses sticking through holes that you cut. Then, put the lens cap over one of the large binocular lenses or tape over one of the front lenses with duct tape. (You really only need a monocular for this.)