Ok Folks, Again, I turn to the first class photographers of MR for knowledge and wisdom, plus to participate in a discussion! I leave a lens attached to a body all the time. Currently, I have a telephoto zoom attached! I like to think I will be ready for the action when it happens and it 'prevents' excessive lens swapping, but I know it is laziness. On an interesting note, most of my lenses are not dusted sealed or weather sealed, so what are people's opinions about leaving a lens attached to a body? What are your pros/cons of such action or the lack of? A few things I consider: 1. Are lens caps a better longterm storage option? 2. Is there evidence that the metal of the camera mount and the metal or plastic of the lens cause detrimental damage or wear and tear? 3. Reading what "Canon and Nikon says" is great, but I think people can share their experiences without the help of big brother. 4. This is a discussion about all camera bodies with a lens cap, not Nikon vs. Canon etc.. 5. Does it even matter? The live free approach!