Here in WI when we're scouting bears; we use Deep Woods Off to keep the bears from bothering our cameras. Some brands don't have a bear proof cage to put on them, so we used a trick told to us by an old timer that used Off to keep bears out of his fridge in his shed. I don't know what it does as far as deer are concerned because we don't care when we're looking for bears, but I DO know what bears can do to a camera.