I bought an EOS 5D Mark III off Amazon a while back, and have had a blast taking it out to the zoo, nature preserves, and botanical gardens to try it out. Unfortunately, what I actually bought it for requires being able to attach to a tripod, and when I finally got that set up, I discovered the plate with the threaded hole to screw it in is missing entirely from the camera. None of my local shops have the part and/or ability to repair it, and Amazon will only honor a full return. I've gotten rather attached to the camera, and don't want to go through the whole rigamarole of returning and re-buying, especially since now I have all these lenses and batteries I bought separately.
Has anyone else had this problem buying camera bodies? I would assume the part is standard. Any suggestions on what to do would also be greatly appreciated.
Canon manufacturers its DSLR's with a integrated tripod mount. You can add a different style plate (optional), but body's don't include the optional plate out of the box.
If your 5D3 doesn't look like this, I would question what's been done to the camera. Arca swiss (quick release) plates are some of the most common accessories. The plate is secured with a recessed type thumb screw and uses a lever for easy on/off.
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It looks like it suffered a fall and the tripod thread ripped out of the bottom.
You might try Midwest Camera Repair to see if they can fix it.