From using the Cudde Back No Flashes and a Bushnell IR, a lot last year and a little the year before, I feel for what ever reason, whether it be noise, the light etc.. the IR"Swill and do seem to spook the older bigger more skittish bucks... somethings going on because I saw time and time again, on a specifice water hole this past summer when we had a nearly drought conditions and extreme fire danger that forced deer to the mostavailable water, along with moose, elk, bears etc.. all in the same water hole.. only the Big bucks I photoed there seemed to spook in reaction to the camera.. all the other younger bucks, does, elk both bulls and cows, bull moose, and even a bear and couple hawks.. didnt seem to mind the camera. Many of the same younger bucks, bull moose, and a bull elk revisited, getting over 50 photos of some of them...I only got 1 visit and no more than 2 pictures in the visitof the three biggest bucks I saw all summer on that water hole via my cameras....never to photo them again.. and I know they had to travel a long ways to other water.. something was up.. jm2c