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| p.4 #6 · Canon EF 40mm f/2.8 STM Lens Firmware v1.2.0 update! |
You've been a little bit lucky, but most likely because you've waited long enough to let the operating system write all files to the card and update the file tables.
It also means that all the pins make and break contact with the camera off. It is much like the idea that with an external USB card reader you put the card in the reader and then connect the USB.
I don't turn off the camera to swap lenses, but I do turn it off to open the card door.
I wait for the camera's write indicator lamp to turn off, then I open the card door with the camera still turned on, and I've been doing it for 6 years now. It won't hurt a thing. On my Hasselblad H3DII-39, you can even insert/remove the card with the camera still on with no ill effects.