New answers tagged dust
The manual for my camera (a Pentax K100D) states that you should turn the camera off to prevent possible damage to the autofocus motor: if you bump the shutter-release button while changing the lens, it's possible that the now-exposed autofocus drive shaft will catch on something.
I think the main reason is to "park" (hard disk terminology) the components. e.g. VC/IS elements can by their nature move around. When you power the camera off, those elements are "parked". I'm pretty certain I've read in manuals/leaflets (yes it's a unsavoury habit I've picked up, I do read manuals..) that come with lenses. This may also be true with focus ...
Top 50 recent answers are included