03-19-2020 08:42 PM
I am having a problem with my canon sl2 and andeer extension tubes with autofocus support. Whenever I change lenses with the extension tube still attached to the camera, the camera will not power on after the lens change unless I take out the battery, and put it back in.
03-20-2020 12:54 AM - edited 03-20-2020 01:06 AM
03-20-2020 03:37 AM
@Nsanti wrote:I am having a problem with my canon sl2 and andeer extension tubes with autofocus support. Whenever I change lenses with the extension tube still attached to the camera, the camera will not power on after the lens change unless I take out the battery, and put it back in.
Review the instructions for the extension tubes. I think you should attach them to the lens, and then attach the combination to the camera. You should not mount the tube on the camera, and then mount the lens to the tube.
03-20-2020 10:33 AM
Oh, yeah. The camera should be turned off when you mount and dismount any lens, especially when using an adapter.
03-20-2020 10:47 AM
"The camera should be turned off when you mount and dismount any lens,..."
You know I used to think this was true but I don't anymore. The last pin to make contact is the power pin. The first one to break contact is the power pin. Once the lens is turned a tiny amount, power to the lens has been removed. Now there may be some reason inside the camera that doesn't like being on when changing lenses but I can't imagine what or why?
03-20-2020 11:07 AM
It is still good practice. often when a pin connects like that there is "contact bounce" so that the lens would recieve and lose power several times in a short period of time. That can cause spikes or just confuse the computer in the lens.
03-20-2020 03:13 PM - edited 03-20-2020 03:15 PM
I just returned the tubes. It's not worth risking my camera, and I'm not even sure extension tubes were right for the type of lenses I own. I have always turned off the camera before changing lenses. These tubes acted funny even though the camera was off.
03-20-2020 12:18 PM
@ebiggs1 wrote:"The camera should be turned off when you mount and dismount any lens,..."
You know I used to think this was true but I don't anymore. The last pin to make contact is the power pin. The first one to break contact is the power pin. Once the lens is turned a tiny amount, power to the lens has been removed. Now there may be some reason inside the camera that doesn't like being on when changing lenses but I can't imagine what or why?
Turning off the camera is what Canon recommends.
Note the bold text near the bottom of the page inside of the first blue box. Does it seem to work with the camera on? Sure, but that does not change the fact that the recommended procedure is to turn off the camera. Doing so helps to protect the inside of the camera from accidents.
03-20-2020 12:55 PM
There is a constant supply of power to the lens when the camera is on, It's the surge produced when that power is abruptly interrupted that could feedback into those tiny, sensitive electronic components within the camera to be concerned about. It's sort of like playing Russian roulette.
03-20-2020 02:31 PM
@John_ wrote:There is a constant supply of power to the lens when the camera is on, It's the surge produced when that power is abruptly interrupted that could feedback into those tiny, sensitive electronic components within the camera to be concerned about. It's sort of like playing Russian roulette.
Yes. It's just good practice to power down electronic equipment before connecting or disconnecting accessories.
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