I'd like to know this too. All my photos are on my Mac. I have 6 folders on my phone. I have the Camera roll, Photo Stream, Photo Library, contacts, Last Import, Last 12 Months......Over 1,000 pictures in just my photo library and I certainly don't need them all on my phone, but I am afraid to sync and lose my camera roll pics which I want to manage manually from the phone. I'm not sure, but in photos in iTunes, I think if you choose the options for Selected albums, events....etc, then it will only sync your camera roll and photo stream. I'm still looking into it.