topic Re: 50 1.2 not focusing in EF & RF Lenses

50 1.2 not focusing

Philmans123 — Sun, 18 Sep 2022 17:18:03 GMT

Hi All,

My 50 1.2 has stopped focusing completely. I can manually focus but the auto-focus is dead. There has been no 'trauma' to the lens. It was working one day and then nothing the next. Any thoughts/suggestions before I send it in to Canon?

Thanks,

Phil

Re: 50 1.2 not focusing

Waddizzle — Sun, 18 Sep 2022 17:30:27 GMT

Which camera body? Does the AF work with other lenses?

Re: 50 1.2 not focusing

Philmans123 — Sun, 18 Sep 2022 17:39:58 GMT

5D4 and 5DSR. All other lens are working with both bodies. Thanks for the response.

Re: 50 1.2 not focusing

deebatman316 — Sun, 18 Sep 2022 17:49:15 GMT

Hi, OP it sounds like a lens issue. Is the lens set to AF mode. The 50 F/1.2 is a USM lens that supports full time manual focus. Without the camera metering system being active. Does the camera even register AF at all.

-Demetrius

40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM

430EX III-RT & 600EX II-RT

Re: 50 1.2 not focusing

Philmans123 — Sun, 18 Sep 2022 18:04:44 GMT

I agree, I think it is in the lens. I am able to control the aperture fully and it is obviously affecting the image, (i.e., DOF and brightness). All AF controls are active but the lens itself is dead.

Thanks for the response.

Re: 50 1.2 not focusing

deebatman316 — Sun, 18 Sep 2022 18:10:10 GMT

Does the lens work on a different camera body if you have one or can access one. Are you using any 3rd party accessories if so remove them and try again from factory.

-Demetrius

40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM

430EX III-RT & 600EX II-RT

Re: 50 1.2 not focusing

Philmans123 — Sun, 18 Sep 2022 18:09:22 GMT

yup, 5d4 and 5dsr

Re: 50 1.2 not focusing

deebatman316 — Sun, 18 Sep 2022 18:16:45 GMT

Will the lens AF on the other body you mentioned. Or does it continue not to AF but you still can control the aperture.

-Demetrius

40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM

430EX III-RT & 600EX II-RT

Re: 50 1.2 not focusing

Philmans123 — Sun, 18 Sep 2022 18:23:18 GMT

AF dead on the second body and I can still control aperture. 😕

Re: 50 1.2 not focusing

deebatman316 — Sun, 18 Sep 2022 18:32:21 GMT

It sounds like your AF motor is dead.

-Demetrius

40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM

430EX III-RT & 600EX II-RT

Re: 50 1.2 not focusing

Philmans123 — Sun, 18 Sep 2022 18:28:56 GMT

Luckily, I am made of money.😭

Re: 50 1.2 not focusing

deebatman316 — Sun, 18 Sep 2022 18:34:59 GMT

I also highly doubt its an electrical contact pin issue. The camera would've thrown a code for "Lens Communication Faulty". You also wouldn't be able to control the aperture automatically or manually.

-Demetrius

40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM

430EX III-RT & 600EX II-RT

Re: 50 1.2 not focusing

Philmans123 — Sun, 18 Sep 2022 18:43:15 GMT

Thanks for the thoughts!

Re: 50 1.2 not focusing

ebiggs1 — Tue, 20 Sep 2022 17:03:11 GMT

"You also wouldn't be able to control the aperture automatically or manually."

That may or may not be true. I agree it is not a lens contact issue, however. It is almost to never a contact issue unless someone abuses them by cleaning them improperly!

The EF 50mm f1.2L is one of my very most favorite prime lenses. It is a somewhat difficult lens to master as focus can be critical. It is big and it is heavy. It is a very old design and yours needs to go to Canon for service.

Re: 50 1.2 not focusing

Tronhard — Tue, 20 Sep 2022 18:30:49 GMT

Is it under warranty?