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I just upgraded my OS from 10.14 to OS 10.15.2, and upgraded from the 2019 version of Lightroom Classic to the new LR Classic 9.1. I have a Canon EOS 5d Mk II and 5d Mk III. Both worked well with Tethered Catpure until these OS and LR upgrades, and now when I start Tethered Capture, it doesn't recognize the camera. I checked connections, restarted and reconnected the camera, restarted the computer, deleted Lighroom Preferences, updated my camera firmware. I tested my cameras on an old computer with OS 10.10 and Lighroom 6, and Tethered Capture still works great on that system.
When my camera is connected, I am able to use the Lightroom Import window to navigate to the card in the camera and download images into lightroom.
Another puzzle piece, is I installed the October 2019 upgrade to EOS Utility, and it also is unable to recognize my cameras. But Lightroom shouldn't require EOS Utility to operate the 5d Mk III, right?
I was on chat with Adobe tech support for 1-1/2 hours, and they weren't able to solve the problem. They suggested I contact Canon support for help.
Can anyone explain how I get Tethered Shooting to work? Thank you!
I believe the problem is the MacOS X 15.2 update. That breaks tethering, not only in Lightroom but -as you have noticed- also in EOS Utility. And if I'm not mistaken also in CaptureOne.
Catalina 10.15.3 fixed it for me on my Canon 5d mkiv and EOS R. I can now tether with no problems.
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MacOSBigSur 11.6.5 ( 2.6 GHz Quad-Core Intel Core i7 )
Canon 5D ii
Cannot Connect to camera via USB
USB item not detectected in About Thi Mac >> System Report >> USB
Camera not appearing in finder or Lightroom.
Forget Eos Utility.