topic Re: Communication between camera and lens is faulty on Rebel t8i in EOS DSLR & Mirrorless Cameras

Communication between camera and lens is faulty on Rebel t8i

bobc100 — Sat, 30 Aug 2025 14:29:50 GMT

When turning on my Rebel T8i and using my Sigma (18-250) or Tamron (18-200) lens, I can only get one to ten pictures before I get the "Communication between camera and lens is faulty" error. Also, the battery seems to run down very quickly. I've tried cleaning the contacts on both lens and camera. My Canon lenses (18-55, 10-18) continue to work fine on the T8, but the Sigma and Tamron lenses work fine on my old Rebel T3.

Something must've changed in the camera since both lenses wouldn't fail at the same time (and keep working on the T3), but I'm afraid a repair shop will tell me it's a lens problem since the Canon lenses are still working. Is it possible I need fresh batteries? They're only 4 years old, but the problem came on gradually and seems to get worse when the batteries are low. Any suggestions?

Re: Communication between camera and lens is faulty on Rebel t8i

stevet1 — Sat, 30 Aug 2025 16:07:29 GMT

bobc100,

Have you enabled your Digital Lens Optimizer?

Look on page 271 of your manual. Go to the first page of your first menu (the red one), and click on the lens aberration correction. Does the name of your lens appear at the top? If it doesn't, your camera might not be communicating with your lens. The Digital Lens Optimizer is one of the options under lens aberration correction.

Outside of that, it almost sounds like a heat issue. It's odd that it would let you take i-10 shots and then quit.

And the fact that your Canon lenses work fine seems to indicate that it's not a camera issue.

New batteries couldn't hurt.

Steve Thomas

Re: Communication between camera and lens is faulty on Rebel t8i

bobc100 — Sun, 31 Aug 2025 11:31:54 GMT

From what I can tell, Digital Lens Optimizer is only available for Canon lenses, but it doesn't seem like that should affect communication between lens and camera. I also forgot to mention in my original post that I've been using the Sigma lens on the T8i for the last 4 years without any problems.

Re: Communication between camera and lens is faulty on Rebel t8i

shadowsports — Sun, 31 Aug 2025 12:09:16 GMT

Greetings,

Two things I would do. One is reset the camera's Main and Custom settings to defaults. Now retest.

Then test with a new battery. I usually replace batteries between three and five years, but I've had several that have lasted much longer. Battery health can depend on frequency of use, number of discharge recharge cycles and storage practices.

Re: Communication between camera and lens is faulty on Rebel t8i

stevet1 — Sun, 31 Aug 2025 12:18:56 GMT

bobc100,

I didn't know that about DLO and Can9n lenses. Thank you for the information.

Have you tried a camera reset?

I'm sorry. I'm at a loss in trying to solve your problem. If your lenses worked fine in the past, but don't work now, but do work fine on another camera, it's got something to do with the camera communicating with those two lenses, but I wouldn't know how to fix it.

Sorry.

Steve Thomas

Re: Communication between camera and lens is faulty on Rebel t8i

bobc100 — Thu, 18 Sep 2025 17:27:09 GMT

I've finally had the chance to thoroughly test both of these things and neither worked.