Untangling Canon's asinine use of proprietary connectors in the AC-E6N AC power adapter


EOS 5D Mark IV
CR Pro
Feb 25, 2015
interesting.. one of the customer reviews describes the adaptor affecting the noise floor in every video:

"... Reviewed in Canada on October 23, 2018
Verified Purchase
I bought this for my Canon 5d mkiii in order to power it during longer recording sessions of audio/video demonstrations I'm making. Since these are demonstrations focusing on sound character the audio quality is a priority. I find it most convenient to simply run the audio source to the camera input rather than try to align the audio later in post. After recording several sessions I noticed a ground hum significantly louder than the noise floor in every video. This led me on a very tedious troubleshooting journey that lasted the past two nights. Only after hours and hours today it dawned on me that I should check the power instead of the audio chain. As soon as I put the battery in I had clean audio again repeatedly. Next I tried making sure everything was powered using the same ground reference but it made no difference. Since this power supply renders the camera's audio input useless I must give it one star, but it seems it should work fine strictly for video..."

That's a ground loop, which is something you should always check for when you have something connected both to ground and mains power. It's sadly not so easy to solve, in a on-stage setting you can usually plug every mains power into the same group/phase, but if you're recording from the back of the room with an audio line snaking to the front, you're out of luck.
Feb 12, 2021
Sorry for resurrecting an old thread, but I put together a more elegant solution to this problem that cost very little.

Parts :

Hammond 1551MBK Enclosure - eBay
3.5mm Barrel 2.1mm pin 12V DC Socket - eBay
Schurter 4840.2220 12V DC Socket - Mouser

ac adapter.jpg
Jul 12, 2013
...stopped here for a few minutes while looking for a thread about some unusual behavior with a 5DMk3 while shooting the recent lunar eclipse [it was working sort of fine but acting abnormally in the way it was metering (I think)]; after switching lenses a couple of times it is back to normal (I hope).

In the meantime, a short eclipse .gif made using hand-held images collected with M6Mk2/70-300 IS II gear--still recovering from the midnight-3am effort:sleep::(:

211119 near total lunar eclipse.gif

My experience with third-party battery grips, batteries, and a/c adapter-battery replacement gizmos has been virtually 100% positive, using batteries and grips for Rebel XT (350D), 40D, 5DMk3; M, M2, M10, M6 and M6Mk2, and a/c adaptors for 40D, 5DMk3 and M6Mk2. Third-party batteries for Powershot ELPH 300, S90 and S95 (this is at least a decade ago) were not as reliable and subject to swelling. It is important to read reviews for these sorts of purchases...it would be far simpler to just buy Canon. I don't mind skimming reviews while reading/learning about a whole range of things along the way.

The a/c adaptor for the 40D enables its usage as a webcam for at-home Zoom teaching; when mated to a 17-55 2.8 IS EF-S lens, the set-up (with fifteen year-old gear) produces Zoom imagery far superior to most any webcam (or iPad/iPhone for that matter), with side-by-side comparisons (even within the compressed Zoom signal) revealing the abysmal dynamic range of most webcams.


(Somewhat) off-topic: I do not recommend third-party ink for Canon's wide format ink-jet printers. Canon's ink & paper live quite nicely together, in terms of print longevity.

On the other hand, at least for the Canon laser printer listed below, third-party toner cartridges works very well...


And completely off-topic (but related to 5DMk3 issues): any recommendations for shutter count software?

Thanks for reading.