P: Canon tethering stopped working after updating to Lightroom Classic v15.4

Hello Adobe Lightroom Support Team,

I am experiencing a tethering issue with Lightroom Classic and my Canon EOS R6 Mark II.

My setup:

• Canon EOS R6 Mark II
• MacBook Pro M5 Max (128GB RAM)
• Tether Tools Pro USB cable
• RAW shooting
• Internal SSD with plenty of free space

During tethered shooting, Lightroom works normally at first, but after 29 RAW photos, the camera shows "PC FULL" and stops shooting.

I have tested the same camera and cable with Canon EOS Utility, and tethering works perfectly without any issues. I also tested the RAW files in Canon Digital Photo Professional 4 and capture one as well, and everything works normally.

I increased Lightroom Camera Raw Cache to 50GB, I have 1.3tb ssd empty storage.

Since the problem only occurs in Lightroom Classic, I believe it may be related to Lightroom's tethering process or buffer management. I have lastest version of lightroom and camera firmware. 

Could you please help me resolve this issue?

Thank you.

 Updated Camera firmware and checked connections and cables. Reverting back to older version it works normally. I can take photos but image review is unavailable and autofocus will stop working while tethered. If I unplug camera functions normally. This update was forced mid workday and now my catalog upgraded so I can’t go back. Please help as this is setting me back on my work.

“Use Canon SDK for tethering Canon cameras” seemed to temperoarily fix the issue of the “PC Full” message popping up. But, now the the catalog just closes on it’s own when I’m shooting or disconects from my camera on it’s own.

Adobe y’all are such a mess. It’s actually ridiculous how bad your live tethering is.

Has these been a resolution to this? I have the same issue and all of my discussions with help have not resolved the issue.

I figured it out! If anyone else has this issue and is pulling their hair out. ;-)

Need to go into your system settings and turn on permissions for removable drives. Oy vey. LOL.
 

I cannot use tether capture with my canon R5 now that I have update to 15.4 as I see others have the same problem. When will this bug be fixed??

Hello,

I am not able to get Lightroom Classic 15.4.1 to connect to my Canon EOS R5 (with the most recent firmware, I just updated today).

My OS is Tahoe 26.5.2, on a MacBook Pro M3 Max.

I am also using a brand new Tether Tools (orange) cord from camera to laptop.

I am able to get Capture One to connect to my camera (through a trial subscription to confirm it will work). When I try connecting camera to Lightroom via the ‘Tether Connection’ option I just get a window that says it is trying to establish a connection and never does. I’ve tried restarting everything, unplugging everything, deleting apps and re-installing them. I also deleted the Lightroom preferences as suggested on this page:

https://helpx.adobe.com/lightroom-classic/desktop/kb/troubleshoot-tethered-capture-lightroom.html

Nothing is working. Any thoughts? 

Thank you.

Larry Lilac posted the solution below: “I also found that checking “Use Canon SDK for tethering Canon cameras” solves the problem. So the native Adobe tethering doesn’t seem to work properly?” it’s in your Lightroom Preferences under the general tab...check the box and then restart Lightroom… THANK YOU LARRY!!!!!!!!

this same thing is happening to me and I have a shoot tomorrow...what a nightmare.

Whatever you updated doesn't work with my R6m3, you’re costing me a lot of time, money and patience...