Its my belief that its all about the deer. Some will spook and some wont. Also, the deer can getused to cameras in certain locations (i.e. bait piles and mineral licks). Especially if you have been using cameras for a number of year (5) like i have.
I put mine out at lunch, today.....for the third yr in a row on the same tree. I "hope" to show you some more evidence of the above in a few weeks.
No idea what's out there.........