running trail cam's since the late 90's, answer is YES< deer notice camera's
MOST camera's however have some sort of sound they make when they take a pic' and that is normally why you get pic's of deer looking at them
second thing is MOST guys that run cam's do NOTHING to descent them, so deer pick up the smell of the plastic, or even battery's
as chemicals are used making them
NEXT is when folks check cam's , the scent from your hands transfers to the camera
all the more so for those that put bait out at time of checking camera's
this is a bigger issue with bears, a bear has a better nose than a deer
handle corn or??
and then your cam, and a bear will find your camera and possible break it once they find it as there curious critters, many will actually try to taste it to see if it something they can eat, after that scent gets on them from bait off your hands
Learned this the hard way over the early yrs, when I would get pictures of a bear, then its nose then its teeth and then inside of its mouth, as it crunched up a camera on me
after I stopped handling cam's without wearing gloves and also, storing them in baking soda( whole cam in a baggie with it, and spraying them down with a scent killer_)
been many many yrs since I lost a cam to a bear!(bear boxes do help too, but use them more for theft control than bear worries)
but simple answer is YES< deer notice camera's