I have the moultrie IR-40 and the deer seem to look at it since the camera makes a small clicking sound but they don't seem to run. I think I might have had one deer that ran from the camera but it was when I had it only a few feet from the trail. I think the IR flash does help but have seen many regular flash pictures of deer that just look at the camera and don't get alarmed. I have to say though I am very pleased with the battery life of my camera compared to others and it has been a great product and hunting tool.