>Do you have a reference to show that changing lenses without >turning camera off can hurt the camera or lens?
D800 (English) manual (among other camera manuals), page 24. Step 1. "Turn the camera off." Nikon's instructions are good enough for me. The camera maker does not have to specify potential damage when providing such an instruction.
>This matter is so trivial that I am not going to look for it. >Besides, then you will claim that somebody is full of it >too.
That's needlessly combative and insulting. Nobody in this thread deserves to be insulted by you.
>But I read about it years ago on one of the forums most likely >on DPReview and that is why I mentioned it.
I read lots of things in forums, now and in years past, including some of what you write. I discount the insistent stuff offered strictly as opinion without any support.
>Think about it. Opening the card door shuts off many cameras,
Opening the card door doesn't shut off my D7000 or my D800. Both camera are fully operational with the card doors open or closed. An open card door does not permit my Canon G1X to operate. Since this is Nikonians and a D800 forum, can we please just mainly reference the D800?
>would you think releasing the lens would not disconnect >something?
When a photographer does not turn off the camera before mounting or dismounting a lens, the photographer is taking a chance that the safe mode designed into the camera's electronics to protect the camera from accidental lens connects/disconnects is going to work each and every time. The product manual states, in the instructions for mounting or changing a lens "Step 1. Turn off the camera." Advising Nikonians to disregard advice in the manual is a poor idea. Electrical and electronic systems often have safeties built in to protect the device from damage caused by common mistakes made by users. Many, many people get away with it for years. The most likely reason for Nikon to state "Step 1. Turn the camera off." in the manual as part of the lens change instructions is that it is the best practice. Advising otherwise is not a good idea unless you're prepared to take responsibility for damage to someone else's camera when they take your advice and then have a problem as a result.
>If this matter was so important it would be posted everywhere >and it would be bigger than left point focusing problem, oil >spots in D600 or light leak from top LCD on Canon 5D3.
The matter has been discussed repeatedly in a variety of forums over the years, and recently too, on Flickr, photo.net, DPReview, CambridgeInColor, byThom, LuminousLandscape, etc., etc., etc. It has been repeatedly discussed on Nikonians too. Why you think that such discussions might make it as big an issue or a bigger issue that any of the thousands of other questions or issues which are discussed on all the forums is a complete mystery. Do tell.