Timeline for Is it dangerous to do a lens change with power on?
Current License: CC BY-SA 3.0
10 events
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| Nov 29, 2017 at 20:22 | comment | added | dgatwood | Actually, there's one other small difference. If a Canon DSLR camera is in live view mode and has an electronically active lens attached, when you start to remove the lens, it treats that communication failure as evidence of lens removal and drops the mirror to protect itself. You can probably put it back in live view mode with a manual lens (I've never tried), but it definitely kicks you out. I'm not sure what it does if you try that in video mode. | |
| Dec 21, 2016 at 7:03 | comment | added | Michael C | While it is not perfectly clear you are saying such, it seems you are at least indicating that you think that the camera has a sensor that detects when the lens release button is pushed. Canon cameras don't have such a sensor. The camera detects a lens is being removed when the electrical power contacts between the body and lens are no longer touching, and even then the sensor is still energized and the mirror, etc. operate exactly as they would with a lens fully attached. The only difference is that the camera won't attempt AF or Av control. | |
| Dec 21, 2016 at 7:00 | comment | added | Michael C | "While I can't prove it, if the sensor having a charge actually could draw in dust, then why on earth wouldn't camera makers cut the power to it when the lens is removed. If they can do it when the camera is powered off, they can do it when the lens is removed too and it would be bad design not to (either that or it simply is an old wives tail that it's a problem)." | |
| Dec 21, 2016 at 1:14 | comment | added | Michael C | The lens release button theory sounds good, but it is incorrect, at least on Canon EOS cameras. You can hold the LRB all the way down and shoot with full camera functionality. You can even rotate the lens and shoot in manual exposure mode (you'll lose control of the aperture - it will stay set where it was when the power contacts were disconnected - but the camera will take a photo). You can even take an exposure when there is no lens attached to the camera at all. | |
| Nov 9, 2013 at 16:01 | history | edited | AJ Henderson♦ | CC BY-SA 3.0 |
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| Nov 9, 2013 at 11:47 | comment | added | Esa Paulasto | This is the only answer so far to mention that the lens release button is not only a mechanical function but is also sending an electronic signal to the camera about a lens removal. | |
| Sep 30, 2013 at 12:08 | history | bounty ended | Esa Paulasto | ||
| Sep 28, 2013 at 16:09 | history | edited | AJ Henderson♦ | CC BY-SA 3.0 |
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| Sep 28, 2013 at 16:04 | history | edited | AJ Henderson♦ | CC BY-SA 3.0 |
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| Sep 23, 2013 at 17:36 | history | answered | AJ Henderson♦ | CC BY-SA 3.0 |