topic Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D in EF & RF Lenses

EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

ssantra — Tue, 30 May 2023 15:14:34 GMT

Hello,

I am using a Canon 77D. Yesterday, I bought a Canon 50 mm f/1.8 STM. But when I try to change the aperture it is giving me the message "cannot adjust aperture, No lens attached." I have no idea why this is happening. I have a canon EFS 55-250 mm lens, with which I can change the aperture and everything works fine. Please help. Thank you.

Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

rs-eos — Tue, 30 May 2023 15:21:11 GMT

Since another lens works, this sounds like the 50mm f/1.8 will need to be repaired. Though due to it's low cost, not sure if the repair would be close to cost of a new lens.

Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

ssantra — Tue, 30 May 2023 15:22:36 GMT

I bought it yesterday.

Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

Stephen — Tue, 30 May 2023 15:33:14 GMT

From personal experience, the mount can be a tiny bit tight when that lens is new. Are you sure it's all the way locked into place? Check out this KnowledgeBase Article for instructions: https://canon.us/45zTmqf

Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

rs-eos — Tue, 30 May 2023 15:40:52 GMT

Oops, didn't catch that detail. Should be under warranty then if a repair is needed. But do first check out the article Stephen posted.

Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

ssantra — Tue, 30 May 2023 15:50:56 GMT

Thanks, for the help. I managed to fix it. The lens is brand new so need to remove from the body and try again. It works now.

Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

Stephen — Tue, 30 May 2023 16:01:46 GMT

Awesome! I'm so glad I could help! 😊

Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

deebatman316 — Tue, 30 May 2023 18:57:55 GMT

This lens has a power retract feature. When you power the camera down the lens should retract to the storage position (infinity focus). Do Not remove the lens from the camera while powered on. If you remove the lens with the camera powered up. The lens won't retract and cause an error.

Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

MikeSowsun — Wed, 31 May 2023 12:57:23 GMT

Only newer cameras made since about 2015 have the lens retract feature. It can be enabled or disabled in the menu.

The lens retract works with STM Lenses like the EF-S 24mm f/2.8 STM, EF 40mm f/2.8 STM, EF 50mm f/1.8 STM, and EF-M 22mm f/2.0 STM, where the front element moves in and out as you focus.

I never power off my cameras when changing lenses. I have done this many times, and have never experienced any errors from removing one of these STM lenses while powered on. Can you tell us why you think it will cause an error message?

Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

deebatman316 — Wed, 31 May 2023 13:19:58 GMT

I causes an error on my 5D Mark IV & EF 50mm F/1.8 STM. It also causes the camera to lockup too. But doesn't cause the error on my old 40D since it doesn't have the power retract feature. The lens manual tells you to focus the lens to infinity. On older cameras which lack the feature.

Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

MikeSowsun — Wed, 31 May 2023 14:14:40 GMT

My 80D is my only camera with the lens retract feature. I also own the EF-S 24mm f/2.8 STM, EF 40mm f/2.8 STM, and EF 50mm f/1.8 STM. None of them cause an error if I remove the lens while the camera is on.

Try using your 5D Mk IV with another STM lens, or try your EF 50mm f/1.8 STM on another camera with the lens retract feature. The error message should not happen just because you remove the lens with the power on.

Can you show us a screenshot of the error message?

Re: EF 50mm f/1.8 STM Lens Generates "No Lens Attached" Error on EOS 77D

deebatman316 — Wed, 31 May 2023 14:19:40 GMT

I doesn't always happen. But it happens every once in awhile. But after updating the camera's firmware I haven't seen it. But when it does happen it's says "Lens communication error".