topic Re: Sudden focusing issue on RF 24-105mm f/4L IS USM in EF & RF Lenses

Sudden focusing issue on RF 24-105mm f/4L IS USM

peter_b — Thu, 16 Dec 2021 04:46:12 GMT

Hello everyone,

I'm new and hope I'm posting this in the correct place 🙂

I took some pictures today with my RF 24-105mm f/4L IS USM lens on an EOS RP. It worked fine, but all of a sudden now, in the rage of 24-50mm or so, the left side of the view field is blurred. I can't focus in that area, and all pictures I take come out blurred (on that side) - see attached image.

What happened? Can this be fixed?

Thank you already!

Re: Sudden focusing issue on RF 24-105mm f/4L IS USM

kvbarkley — Thu, 16 Dec 2021 14:22:42 GMT

Something is decentered on the lens. You will have to send it to Canon.

Re: Sudden focusing issue on RF 24-105mm f/4L IS USM

shadowsports — Thu, 16 Dec 2021 14:42:12 GMT

Greetings,

Blurry with all attached lenses or just the 24~105? Were you moving when this image was captured?

Re: Sudden focusing issue on RF 24-105mm f/4L IS USM

ebiggs1 — Thu, 16 Dec 2021 15:18:25 GMT

You need to call Canon. (1 (800) 652-2666) It does look like something decentered. Did it get dropped or a severe hit?

Re: Sudden focusing issue on RF 24-105mm f/4L IS USM

kvbarkley — Thu, 16 Dec 2021 15:21:57 GMT

Hard to move on just one side of the image!

Re: Sudden focusing issue on RF 24-105mm f/4L IS USM

kvbarkley — Thu, 16 Dec 2021 15:23:25 GMT

You can do the newspaper test:

http://www.bobatkins.com/photography/technical/lens_misalignment.html

Re: Sudden focusing issue on RF 24-105mm f/4L IS USM

peter_b — Fri, 17 Dec 2021 03:19:25 GMT

Thank you very much, everyone, I really appreciate your answers!

I really can't recall it getting hit or bumped against anything...no sign of that, and I think I'd have noticed...but I'm not sure..

I'll call Canon, and might need to send it in, as some of you suggested...

Thank you very much!

Re: Sudden focusing issue on RF 24-105mm f/4L IS USM

Hazel_T — Thu, 30 Dec 2021 23:47:20 GMT

Hello peter_b,

Looking at the photo I agree with other posters that the lens most likely needs to be sent in for service. There are a couple of things to check before sending it in. First it would be good to try cleaning the front and back lens elements with a dry microfiber cloth. Sometimes if there is a smudge on the elements it can cause an issue like this.

If that doesn't resolve the issue the next thing would be to try loading a different memory card in the camera. This looks more related to the lens, but it would still be good to double check just in case the card isn't saving the files correctly.

One last thing would be to attach a different lens on the camera to make sure the same thing happens. In some cases an issue like this can be related to an issue with the sensor, so it would be good to check. If this is happening with all of your lenses we would recommend sending in the camera body. If it is only happening with this one lens we would recommend sending in the lens.

If you need assistance with sending the lens or camera in for repair you can call our support team at 1-800-652-2666 from 9 a.m. to 9 p.m. Eastern time Monday through Friday and 9 a.m. to 7 p.m. Eastern time on Saturday.

Thanks

Hazel

Re: Sudden focusing issue on RF 24-105mm f/4L IS USM

Macgeekppc — Thu, 13 Jul 2023 10:39:11 GMT

Did you ever get it fixed? And if so, how?

Re: Sudden focusing issue on RF 24-105mm f/4L IS USM

peter_b — Thu, 13 Jul 2023 18:17:36 GMT

I inspected the back side of it closer, and it turned out that one of the screws was loose. So I just tightened it and the issue went away.

Re: Sudden focusing issue on RF 24-105mm f/4L IS USM

wq9nsc — Thu, 13 Jul 2023 22:18:41 GMT

Glad it was an easy user fix. And I hope this was a one off QC issue because that screw was likely loose from the moment it came off the line and finally loosened enough to create an optical issue.

Sounds like the hot shoe installation guy got promoted from the camera body to the lens assembly line 😂

Rodger

Re: Sudden focusing issue on RF 24-105mm f/4L IS USM

ebiggs1 — Fri, 14 Jul 2023 14:16:46 GMT

"So I just tightened it and the issue went away."

I would certainly be skeptical about that being the cause. Hope it is for your sake but don't be surprised if the condition returns.