you should firmly fix the binoculars to a tripod. You
can do this with duct tape (what else?).
out a shield made of cardboard and tape it to the front
of the binoculars with the lenses sticking through holes
that you cut.
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.)