I've been playing w/ this thing for the last hr. and I like it. What's a good range for pics? The spot I'm setting it up in has tons of trees in good locations, is it better 10' or 20' or 30' from the deer? I guess it's best to face it as they're coming down the trail in the early evening so as to get pics while it's still light rather than face it the way they're travelling right?