To ensure maximum trail cam photos, I recommend a two-punch approach to attracting deer in front of your camera. Where legal, I like to use some kind of attractant with a strong odor, which will draw deer in to the camera site quickly. This might be something like corn, apples, or a manufactured attractant like Big & J's BB2. I then like to place a longer-lasting mineral alongside that attractant, which is what will keep deer returning to the camera site well after that corn or other material is gone. Mineral products like Trophy Rocks, Whitetail Institute's 30-06, and many others can fit this bill.