iFixit - Answers With Device "Canon Lens"

Canon Lens: Canon EF 16mm-35mm f2.8 L ii Heavy Fungus

Tue, 08 Sep 2026 09:34:25 -0700

Hi All, I'm new here. I need help how to disamble and assemble my lens. I need to clean and remove mold fungus from the elements.

Canon EF 24-105mm F4.0 L IS USM Objektiv: Canon EF 24-105mm f/4L IS USM freezes the camera when zooming past 24m

Tue, 08 Sep 2026 02:13:21 -0700

Canon EF 24-105mm f/4L IS USM freezes the camera when zooming past 24mm – no error message

Hello everyone,

I have a problem with a Canon EF 24-105mm f/4L IS USM (first generation) and I would like to know if anyone has experienced something similar.

The lens works perfectly when set to 24mm. I can take pictures normally without any problems.

However, as soon as I rotate the zoom ring even slightly beyond 24mm — for example, at around 30mm — the camera becomes completely unresponsive when I try to take a picture. The shutter does not operate and the camera appears to be frozen.

There is no error message or Err 01 displayed.

The only way to recover the camera is to turn it off and turn it back on.

The problem is completely reproducible and seems to depend specifically on the zoom position:

24mm: everything works normally
Around 30mm and above: the camera freezes when I try to take a picture
No error message is displayed
I have to power the camera off and on again to recover it
The problem occurs again every time I zoom past the problematic position

I have tested the lens on multiple Canon camera bodies, including different models from the 5D, 6D and 7D series, and the behavior is the same with all of them.

Therefore, I believe the problem is definitely related to the lens rather than to a particular camera body.

I am aware that the first-generation EF 24-105mm f/4L IS USM is known for problems with the aperture flex cable, and I have found several reports of Err 01 and aperture failures related to this cable.

However, my case seems slightly different because:

There is no Err 01 or other error message.
The camera freezes specifically when the lens is zoomed beyond a certain focal length.
At 24mm the lens works normally.
The problem occurs consistently on different Canon camera bodies.

Could this still be caused by the aperture flex cable, perhaps because the cable or another internal flex cable is being moved or stressed when the lens is zoomed?

Could there be another component inside the lens that changes position mechanically during zooming and causes an electrical connection problem?

Has anyone experienced this exact or similar behavior, especially a 24-105mm that works at 24mm but causes the camera to freeze as soon as it is zoomed to around 30mm or beyond?

I would especially appreciate feedback from anyone who has opened or repaired this lens and might know which internal component could cause a problem that is dependent on the zoom position.

Thank you very much for any advice or suggestions!

⟐ Answer edited 9월 08, 2026 at 2:13 GMT-7

Canon EF-S 18-55mm F3.5-5.6 IS II: I cannot find this part. Can anyone help me

Wed, 02 Sep 2026 20:38:46 -0700

I own a canon 18-55mm is ii. The small flex cable that tucks into the inners of the mount ring and plugs directly into the main board. Looks like a capital g. Any ideas?

⟐ Edited 9월 02, 2026 at 20:38 GMT-7

Canon Lens: How to solve 70-200 f4 is focus slipping issue?

Sat, 22 Aug 2026 19:29:37 -0700

how to solve issue like this.

can any one has a repair guide?

https://www.youtube.com/watch?v=DS9GBM8-...

⟐ Commented 8월 22, 2026 at 19:29 GMT-7

Canon EF 70-200mm F2.8 L IS USM: Optical Element Alignment After Disassembly

Mon, 15 Jun 2026 08:55:08 -0700

I have a Canon EF 70-200 2.8L IS USM. The MF ring doesn't work but the AF works most of the time. Sometimes the AF seems to "get lost" and doesn't want to focus, but will eventually start working again. My guess is that the encoder disk is dirty or scratched, affecting the AF. The MF ring is probably slipping. I am thinking about taking the lens apart in an attempt to see what's going on. What is holding me back is that I have read that the optical elements must be realigned following any disassembly and it is not exactly DIY friendly. I am interested in opinions from people who have done similar disassembly/repairs like this, and what their outcomes were.

Canon EF-S 18-55mm F3.5-5.6 IS II: My lens has problems with the AF

Sat, 23 May 2026 13:55:11 -0700

I bought the camera with a used lens, and when I try to use the AF, it always gets "stuck" and if the focus is very close, it doesn't move at all (when it's open, it closes and then gets stuck), I have also noticed that the zoom movement is not as smooth as it should be (mainly when I am at 22mm), it gets slightly stuck and then works normally. I have already tried other lenses and the AF with my body (Canon T5) works perfectly. Is it feasible to try to repair it?

Canon EFS 18-55 IS Kit lens: Auto focus don't focusing properly

Wed, 13 May 2026 02:38:50 -0700

Auto focus don't focusing properly

Canon EFS 18-55 IS Kit lens: Kit lens autofocus not focusing properly

Sat, 03 Jan 2026 17:44:49 -0700

Good afternoon everyone,

Today i present my trusty old 18-55 kit lens (F3.5-5.6) which has been gradually failing. I was teaching someone a bit about cameras and were trying to take photos and it just stopped. When holding the shutter button down half way, the lens focus ring barely moves if at all. This either requires me to manually focus my shots now or use my other non-IS lens (my 75-300 EF).

I use a 450D ancient camera and i have verified the aforementioned zoom lens works with AF perfectly, however not the kit lens.

I would assume my AF motor is toast however does anyone have any suggestions for fixing this apart from tearing it down (I'm going into this blind as there are no guides on ifixit for this seemingly common place lens).

⟐ Answered 1월 03, 2026 at 17:44 GMT-7

Canon EF-S 18-55mm F3.5-5.6 IS II: Camera EOS 600D doesn't turn on with this lens

Thu, 01 Jan 2026 15:40:25 -0700

Hello, Got a Canon pakkage with Canon EOS 600D camera and two lenses; a 50mm-0,45m/1,5ft and a Canon EF-S 18-55mm F3.5-5.6 IS II. The 50mm lens is working good, but the 18-55mm lens doesn't turn the camera on. The fisrt two times i tried this lens, it was working. After that it didn't anymore. Took out the simcard and batterypack and disconnected the lens. Put everything back in place and the camera was working for a small period of time. Now the camera doesn't turn on with the 18-55mm lens; camera still works good with 50mm lens. Do you have any suggestions? thank you, greetzzz, André

Canon EF 28-135 f4.0 IS USM: AF issues can someone please help

Fri, 29 Aug 2025 15:09:36 -0700

why is my lens not holding focus on AF but MF it works just fine

This is what it is doing

So I got the motor yesterday and but everything back together and now it’s says make sure Lens is attached when in video mode and then when I go to photo the f stop flashes from 3.5 to 0 and the af mode goes from -ai servo to MF idk what I did wrong or if the guy sold me a faulty motor

⟐ Commented 8월 29, 2025 at 15:09 GMT-7

Canon Lens: The top of my lens is slightly coming off, how to fix?

Wed, 16 Jul 2025 21:19:58 -0700

So basically, the top of my lens is slightly lifting on one side, which can be seen in the picture with my hand in it. Currently, it doesn't seem like too much of a concern, but I am worried that it will get worse.

⟐ Answer edited 7월 16, 2025 at 21:19 GMT-7

Canon EF 35mm F1.4 L USM: Autofocus hunts back and forth fast and won't lock on subject usually.

Sun, 01 Jun 2025 21:33:16 -0700

Autofocus hunts back and forth fast and won't lock on subject usually. If it is brighter it seems to lock at least in the inside room I tried it in. Wondering what parts fail and how can I get it fixed or dyi at a reasonable price.

Canon EF 70-200mm F2.8 L IS USM: focus ring stops short

Tue, 27 May 2025 14:40:13 -0700

My focus ring is fine to infinity, but stops at 3 on the low end. Can this be repaired?

⟐ Answered 5월 27, 2025 at 14:40 GMT-7

Canon EF 35mm F1.4 L USM: How to disassemble front

Sat, 24 May 2025 06:25:24 -0700

Someone does know how to remove part ya-3399?

⟐ Answered 5월 24, 2025 at 6:25 GMT-7

Canon EF 70-200mm F2.8 L IS USM: Canon zoom "70-200 2.8L is" focusing infinity problem

Sun, 19 Jan 2025 00:28:05 -0700

Hi, I have a Canon zoom "70-200 2.8L is"

It has a problem in focusing at infinity.

If the lens is set to 10m and the subject at 500m the focus (autofocus) stops at about 20-30 m

If the lens is set beyond infinity the focus (autofocus) works.

I tried to adjust the trimmers present in the lens (noting the prime references) but I was unable to solve the problem.

I suspect that a slot (the last one) of the autofocus encoder is dirty or something similar.

@zephosk Help Me :-D

⟐ Answer accepted 1월 19, 2025 at 0:28 GMT-7

Canon EF 70-200mm F2.8 L IS USM: autofocus seems to be hunting endlessly with no resolve

Sun, 12 Jan 2025 00:33:45 -0700

I've recently had this issue, it was dropped, didn't need a new zoom key, now the autofocus seems to be hunting endlessly with no resolve, it was doing it after the drop unless the non functioning zoom ring was set to 135mm (where the lens was stuck), now no matter where the zoom is, no resolve...

⟐ Commented 1월 12, 2025 at 0:33 GMT-7

Canon EF-S 18-55mm F3.5-5.6 IS II: Can it be fixed easily?

Sat, 28 Dec 2024 18:34:02 -0700

My lens worked well for years and then when taking pictures it stopped focusing normally. I did not drop it and now it won't focus although it will slightly move the focus trying to focus. This is the second lens that this has happened to. My body is a T2i. It does not give errors and looks fine.

⟐ Answered 12월 28, 2024 at 18:34 GMT-7

Canon EF 35-105mm F4.5-5.6: Mount replacement for the lens?

Wed, 23 Oct 2024 17:43:23 -0700

I have a bent mount. How do I replace it with a new one? Where can I find a new mount to buy?

⟐ Answered 10월 23, 2024 at 17:43 GMT-7

Canon EF 28-135 f4.0 IS USM: Zoom not working broken?

Sun, 20 Oct 2024 18:19:04 -0700

I'm not sure that this is the same lens as mine but this is my problem: I was trying to but my camera in the bag but the zoom was all out so it wouldn't fit. I tried to zoom out and I did but it was stuck and I had to force it a little and after forcing it it doesn't zoom in anymore. The ring turns perfectly but it does nothing. I also hear a little noise inside like a lose peace? Did I broke my lens?

⟐ Answered 10월 20, 2024 at 18:19 GMT-7

Canon EF 28-135 f4.0 IS USM: Why can’t my lens focus whether on auto focus or manual?

Sun, 20 Oct 2024 16:09:19 -0700

When i try focusing by pressing the shutter button halfway,i hear the mechanism working but the camera won’t focus at all even when i use manual focus.please what can cause this?

⟐ Answered 10월 20, 2024 at 16:09 GMT-7