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Canon 2xTC with T-ring

Started 7 months ago | Discussions
orbmansony
orbmansony Contributing Member • Posts: 741
Canon 2xTC with T-ring

I have an older version of the Canon 2x EF extender (model II), and want to use it with a T-ring attached to a telescope and my 7DII camera body. I keep getting an error message on the camera that the camera is not communicating with the lens and to clean the contacts. As there are no contacts on the T-ring, I am stuck. The 2x works fine with a normal lens. Not sure if this thread belongs in this forum or the 7D forum, but help would be appreciated. I know that there was some issue in the past with my Kenko 1.4x TC where I had to tape down some of the pins.

Thanks, Orb . . .

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John Crowe
John Crowe Veteran Member • Posts: 3,476
Re: Canon 2xTC with T-ring

For lenses without contacts you have to isolate the pins of the EF 2x from the body.  I don't want to gum up the pins so I simply put a little strip of paper into the camera mount and attach the teleconverter.

For manual lenses you are not trying to maintain aperture electronics so you can simply cover all the pins.

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orbmansony
OP orbmansony Contributing Member • Posts: 741
Re: Canon 2xTC with T-ring

John Crowe wrote:

For lenses without contacts you have to isolate the pins of the EF 2x from the body. I don't want to gum up the pins so I simply put a little strip of paper into the camera mount and attach the teleconverter.

For manual lenses you are not trying to maintain aperture electronics so you can simply cover all the pins.

Thanks! That solved the problem.

Orb . . .

 orbmansony's gear list:orbmansony's gear list
Canon EOS 50D Canon EOS 7D Canon EOS 7D Mark II Canon EF 50mm F1.4 USM Canon EF 200mm f/2.8L II USM +4 more
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