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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 ...


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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.


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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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