topic Re: R8 buffer freezes after taking one photo in EOS DSLR & Mirrorless Cameras

R8 buffer freezes after taking one photo

Gravity — Wed, 31 Jul 2024 03:05:50 GMT

When I take a single photo with my R8 camera using the Cannon EF mount adapter and my Rokinon14mm F2.8 Full Frame Ultra Wide Angle (w/ built in chip), My R8 will freeze up on me. The screen goes black, the shutter fires like it is taking a picture, the red buffer light turns on, and it gets stuck like this indefinitely. Not only do I have to turn off the camera, I need to remove the battery.

The 14mm Rokinon lens works with my EOS Rebel T7.My Cannon EF to RF adaptor works with my Sigma 70/200mm lens. I turned on "Release shutter without lens." I have not seen any more suggestions on any forums.

Re: R8 buffer freezes after taking one photo

stevet1 — Wed, 31 Jul 2024 12:59:34 GMT

Gravity,

You might look to your memory card. Either re-format the one you've got, or buy another.

Steve Thomas

Re: R8 buffer freezes after taking one photo

March411 — Wed, 31 Jul 2024 13:47:23 GMT

To Steve's point, exactly what memory card are you using? Normally a buffer challenge is connected to the card.

Have you tried another card?

Re: R8 buffer freezes after taking one photo

kvbarkley — Wed, 31 Jul 2024 14:03:22 GMT

You might also turn off lens corrections, the camera should just ignore corrections for the lens, but if it is reporting itself as another lens, it may confuse the camera.

Re: R8 buffer freezes after taking one photo

Gravity — Wed, 31 Jul 2024 14:56:52 GMT

I did some more troubleshooting and am less optimistic of a solution.

All of my gear works with other products. It seems like a software issue between the Rokinon lens and the R8. My SD card is a 256GB 200Mb/s v30. Taking a single picture should be fine and it works specifically with every other lens. When I listen carefully the Shutter never closes and I think that is why the red buffer light is stuck on. The "solution" is to put tape over the pins on the Rokinon lens. However, this means I'm stuck in whatever aperture I used last on my Rebel T7.

Turning off lens corrections did not help, but it made me notice that when the pins are not covered the camera has a weird bug where the aperture doesn't show up at all. Normally the screen should say "f00" when the camera is not connected to the lens. Instead the aperture section is blank. Please let me know if there is anything I can do on my end.

This is how the screen looks when the pins are uncovered. There is no aperture value.

Re: R8 buffer freezes after taking one photo

stevet1 — Wed, 31 Jul 2024 15:03:36 GMT

Gravity,

Yes, the aperture is a function of the lens, not of the camera. If your aperture is showing a blank screen, it means that the camera is not electronically communicating with the lens.

You wrote, "Taking a single picture should be fine and it works specifically with every other lens."

Time for a different lens, methinks.

Steve Thomas

Re: R8 buffer freezes after taking one photo

lmmeredith — Mon, 02 Dec 2024 23:00:11 GMT

I have the same problem. Have a Canon R8 with a Canon mount adapter. Using a Tamron 28-300 F3.5-6.3 lens. Works if auto focus is OFF, but when it’s ON the camera freezes. Need to turn the camera off and remove the battery. Based on the solution provided I am assuming the communication between the camera and the lens for auto focus is not working.

i have tried several cards as well as reformatting them and that doesn’t solve the problem.

Re: R8 buffer freezes after taking one photo

March411 — Tue, 03 Dec 2024 01:00:58 GMT

Hey lmmeredith,

We recently helped another Tamron owner resolve a R body conflict by suggesting they update the lens firmware. They were lucky and had a Tamron office with a short drive from their home. The firmwar update was completed and the lens (older version) worked once the update was completed. I looked at your lens on the Tamron site and a message was posted Jan 15, 2020 that stated:

New firmware version makes the model compatible with Canon EOS R series cameras (*1) and Canon "Mount Adapter EF-EOS R" for general operations(*2).
(*1) Compatible cameras: EOS R / EOS RP / EOS R5 / EOS R6

Might be worth trying the update if you have the means to do it easily.

Re: R8 buffer freezes after taking one photo

Waddizzle — Tue, 03 Dec 2024 01:01:30 GMT

I noticed that you are using Tv mode. That mode requires the camera to control the aperture, which it is unable to do.

With a fully manual lens you should be using either Av or M. You may also might want to enable the setting that allows you to “release shutter without lens attached.”

I didn’t pay attention to see if anyone else asked about the brand of mount adapter. You only want to use Canon mount adapters.

Re: R8 buffer freezes after taking one photo

lmmeredith — Tue, 03 Dec 2024 04:11:33 GMT

Hey Marc

Thanks For the information! I will try updating the firmware and let you know if that solves the problem.

— Lynn

Re: R8 buffer freezes after taking one photo

kvbarkley — Tue, 03 Dec 2024 13:37:57 GMT

Note: this is the firmware for the *lens*, not the *camera*.

Re: R8 buffer freezes after taking one photo

lmmeredith — Sat, 21 Dec 2024 18:58:54 GMT

Hi Marc,

Thanks for the firmware update tip. I was unable to perform the update myself, so sent the lens to Tampon for update. I received the lens back this morning with the firmware updated. Very happy to report that the lens now operates without failure - even out to 300mm with AF and AS turned on!

Thanks again and to others who responded to my post.

-- Lynn

Re: R8 buffer freezes after taking one photo

March411 — Sat, 21 Dec 2024 20:08:24 GMT

Lynn, always glad to hear when a favorite piece of equipment can remain in a persons collection. Glad it worked out, kind of like an early Christmas present.

Re: R8 buffer freezes after taking one photo

Nixmix — Wed, 23 Apr 2025 23:50:43 GMT

I have same problem with same lens and camera lol. I'll need to try that update, because I bought this lens as not working, but works perfect on 70d, but not on R8...i need to take battery out...now I have hope that an update will fix it... fingers 🤞