The bayonet rings of lenses are generally metal so the contacts on the camera's bayonet ring are designed to short out anyways. There really should be no harm in changing lenses with the camera powered on. If anything its useful to power cycle on manual lenses so you can update the focal length, but that's about all I do.
On Fri, Apr 25, 2014 at 3:28 AM, John Coyle <[email protected]> wrote: > I might have changed lenses with the power off a dozen times in the last > twenty years - never found > an issue afterwards. > > John Coyle > Brisbane, Australia > > > > -----Original Message----- > From: PDML [mailto:[email protected]] On Behalf Of Mark C > Sent: Friday, 25 April 2014 12:47 PM > To: Pentax-Discuss Mail List > Subject: Re: Well, this is annoyi8ng. > > As a general rule I power off before changing lenses because I assume that a > charged sensor will > attract dust. But I surely have changed lenses with the power on more than a > few times and have > never noticed any issues. I may not be the best observers of this kind of > thing, though. > > On 4/24/2014 3:22 PM, Bruce Walker wrote: >> On Thu, Apr 24, 2014 at 2:05 PM, P.J. Alling <[email protected]> >> wrote: >>> Shoot with a manual focus lens, the four way controller defaults to >>> its quick menu functions, don't turn the camera off, just change >>> lenses to an auto focus lens. The four way controller returns to >>> it's previous setting of controlling the autofocus points. Turn the >>> camera off before changing the lens then turn it back on and it >>> doesn't, What? Maybe it's just my camera. >> That's not something I'd ever notice because I _always_ power off my >> camera to change lenses. Without fail. Not a good idea at all to do >> that under power. >> >> I expect that wiping live contacts across the lens contacts as the >> lens cylinder rotates into lock will cause untold glitches and >> ambiguous signals at the very least; possibly dangerous to either the >> body or lens electronics. >> >> I know that changing the flash while powered is bad because I blew up >> an AF540FGZ that way. $180 to fix that gaff. >> >> And pulling or inserting CF cards under power is likely to damage data. >> >> Anyone else change lenses without powering down the camera? >> > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
