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I was shooting video with my Rebel T2i (Canon 50mm 1.4 lens) when I got an error saying:

Err 70

Shooting is not possible due to an error.
Turn the camera off and on again or re-install the battery.

I reset camera settings, took the battery out, formatted the memory card, and still haven't had any luck. Any help would be appreciated.

Thanks.

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First place you should have checked is attached CD that has troubleshooting application... – peter_budo Oct 4 '11 at 5:59
    
Have you tried an additional memory card? – Roflo Oct 22 '12 at 22:32
    
Solution I found for Canon 7D... reikan.co.uk/photography/blog/?p=1550 – user21784 Aug 24 '13 at 15:13

From some google searching I've found this to be a common problem, specially for higher end bodies like 5D Mark II. This page contains some details of the error, you can take a look.

However, if this continues to happen even after you did what the camera instructed you to do, its best you send it back to Canon for a check. If its still under warranty, they'll fix it or replace it.

Also, did you upgrade your firmware or added a grip? Some people reported this error after they've started using a grip or after they upgraded their firmware.

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protected by mattdm Apr 14 at 1:54

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