Ever pulled a lens out of your bag and accidently turn off something vital like AF or IS/VR? Keep that from happening by putting a piece of gaffers tape over the AF and VR switches. The tape will keep you from accidently screwing up your settings when changing lenses. Gaffers tape is better than other types because it’s  non-marking and resealing which means you can peel it back and replace it when you need to turn off AF or VR.