Sorry to hear about this.
davidmtml wrote in post #16155686
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researching online, I was able to find a few instances of other people who had this happen when using non-Canon extension tubes on the 5D. Sounds like it's probably a blown fuse..
I hadn't heard this before. But when I did a search I found a few more reports of the same happening. There must be a short in the electronics, but it's beyond me why it would primarily effect 5D classic.
Exactly which set were you using? Is it the newest type that can be used with EF-S lenses, too? Is it the set with the metal bayonet mounts, or the cheaper one with the plastic bayonet?
The Vivitar tube set is exactly the same as what's sold under the Bower, ProOptic, Jessops and several other brand names. I am fairly certain they are made by Zeikos and they are sold under that brand name, too. Pretty sure Polaroid, CowboyStudio, Phottix, Aputure, Meike, HD3 and Xit brands are just relabelled Zeikos, too.
Fotodiox, Neewer and some other brand names also might be the same. But may be different. I'm just not sure. They have a different release button.
I know for certain that the Kenko are not made by Zeikos... are made by THK or Tokina/Hoya now (I've been using a set for many years).
Opteka is now making their own tube set, too.