My D7000 has dust bunnies and I`m pretty careful when changing lenses. I can see them at f8 images too. To date I have found the in camera dust `shaker` ineffective and don`t bother using it anymore. I`ve tried the rocket blower and not much success either. I guess I`ll have to get the copperhill wet clean kit. Has anyone got and used effectively the Arctic butterfly. A friend of mine told me a couple of years ago that he had one and it worked really well in eliminating the dreaded bunnies.