New answers tagged power
Just wanted to add to this thread in case my solution can help anyone else. I just had a similar issue, occasionally got an Error 80 when powering up. I would get no display with any of my cards in, but if I took the card out my display would start up again, but obviously I couldn't take any photos. As soon as I put a card in, the display wouldn't work ...
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 ...
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