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New Contributor
Posts: 4
Registered: ‎03-19-2020

Camera problem with extension tubes

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.

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Reputable Contributor
Posts: 787
Registered: ‎12-24-2013

Re: Camera problem with extension tubes

[ Edited ]
It sounds like your extension tubes are having intermittent, or poor connections, with the electrical contacts between the lens and camera.  It is a fairly common problem with cheaper 3rd party extension tubes, especially if you mount 2 or 3 tubes together. 
 
Here are a couple of reviews from Amazon:  
 
"The primary issue is stability. The tubes to not fit together tightly as a lens and camera do. There is a tiny bit of slack. With just one tube it’s not a big deal. When using all 3 together it’s very noticeable. If the weight of the tubes and lens is not fully supported there will actually be a slight arch in the tube set. It is enough to loose connection between the lens and camera causing the camera to shut off. It can also cause the image to be soft since the bend will cause the image to hit the sensor at a slight angel instead of straight on."
 
 
 
All three of the adapters wouldn't keep any electrical connection. Therefore, there is no autofocus. Its not metal construction either, its made of plastic. The return I wanted to do would cost me more than the 5 dollars I was offered from this seller. I had no choice but to accept the 60% discount and keep the faulty product. In the end I was left to pay 40% of the price for a worthless product that I threw in the garbage! Andoer has some really good products... but this one is junk. Stay away."
Mike Sowsun
S110, SL1, 80D, 5D Mk III
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Posts: 9,201
Registered: ‎08-13-2015

Re: Camera problem with extension tubes


@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.

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"Doctor told me to get out and walk, so I bought a Canon."
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Posts: 9,201
Registered: ‎08-13-2015

Re: Camera problem with extension tubes

Oh, yeah.  The camera should be turned off when you mount and dismount any lens, especially when using an adapter.

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"Doctor told me to get out and walk, so I bought a Canon."
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Posts: 12,252
Registered: ‎12-07-2012

Re: Camera problem with extension tubes

"... the camera will not power on after the lens change unless I take out the battery, and put it back in."

 

This is a red flag to me.  I would buy some real Canon tubes and not use those anymore. The camera doesn't like them.

EOS 1DX and 1D Mk IV and several lenses!
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New Contributor
Posts: 4
Registered: ‎03-19-2020

Re: Camera problem with extension tubes

after some more testing I discovered it really doesn't matter if the tube is connected to the camera or the lens. after powering off the camera and changing to a lens with the tube attached it won't power on unless I pull out and put back in the battery. I've come to the conclusion that the use of $15 tubes is not worth it to possibly damage my $400 camera.

 

does anyone think I caused damage to the camera by trying this. It seems to function fine now.

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Posts: 12,252
Registered: ‎12-07-2012

Re: Camera problem with extension tubes

"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?

EOS 1DX and 1D Mk IV and several lenses!
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Respected Contributor
Posts: 1,379
Registered: ‎03-01-2014

Re: Camera problem with extension tubes

I'd say from the odd symptoms you have described the potential to cause damage to your camera is real. You should quit while you're ahead and toss your tubes!

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Posts: 12,252
Registered: ‎12-07-2012

Re: Camera problem with extension tubes

"does anyone think I caused damage to the camera by trying this...."

 

It can't be good because Canon tubes don't do that.  It may not damage the camera but like you said $15 vs $400.  Why risk it?

EOS 1DX and 1D Mk IV and several lenses!
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Esteemed Contributor
Posts: 3,789
Registered: ‎02-17-2016

Re: Camera problem with extension tubes

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.

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