iFixit - Answers With Device "Canon Lens"

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 January 03, 2026 at 17:44 MST

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 August 29, 2025 at 15:09 MST

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

Tue, 22 Jul 2025 09:09:46 -0700

how to solve issue like this.

can any one has a repair guide?

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

⟐ Commented July 22, 2025 at 9:09 MST

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 July 16, 2025 at 21:19 MST

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 May 27, 2025 at 14:40 MST

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 May 24, 2025 at 6:25 MST

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 January 19, 2025 at 0:28 MST

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 January 12, 2025 at 0:33 MST

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 December 28, 2024 at 18:34 MST

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 October 23, 2024 at 17:43 MST

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 October 20, 2024 at 18:19 MST

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 October 20, 2024 at 16:09 MST

Canon EF 600mm f4L IS USM: How does this ribbon cable connector open?

Sun, 04 Aug 2024 14:30:13 -0700

To replace a switch plate on this Canon Lens, I need to remove the ribbon cable from the brown and white connector in the lens.

This type of connector is probably used in other electronic equipment so even if you have not disassembled a lens, you may know how to open this connector.

Photo 1 shows the ribbon cable of the part I need to remove locked into the brown and white connector.

Photo 2 shows a side view of the brown and white connector.

How does this ribbon cable connector open? Does the brown part slide down in photo 1 toward the ribbon cable or does the bottom edge of the brown part lift up to release the ribbon cable?

Photo 3 show the new switch plate with the attached ribbon cable.

Photo 4 shows the new ribbon cable with the conductors exposed near the end.

The lens was first sold in September 1999 so the connector is of that vintage.

Canon said there where no instructions available when I ordered the part.

⟐ Answer accepted August 04, 2024 at 14:30 MST

Canon EF 35-105mm F4.5-5.6: The lens on my camera

Sat, 21 Oct 2023 11:27:03 -0700

How do I open the camera lens now?

⟐ Answered October 21, 2023 at 11:27 MST

Canon EF-S 18-55mm F3.5-5.6 IS II: How to disassemble and remove lens fungus from inside?

Fri, 15 Nov 2024 01:10:07 -0700

I have a Canon EF-S 18-55mm f/3.5-5.6 IS II which came along with my Canon EOS 650D and has lens fungus internally. I can't really afford to have it getting cleaned by a professional and I am not new to tinkering and disassembling things. The lens fungus affects my shots terribly, making the light all fuzzy and scattered.

I can't seem to find a disassembly guide for the specific lens either, those on youtube are for older models/versions of the lens and I am unsure whether how they disassemble it applies also to what I have.

⟐ Edited November 15, 2024 at 1:10 MST

Canon Lens: Is my lens cracked?

Thu, 21 Nov 2024 00:45:53 -0700

Is my lens cracked? I've tried cleaning it but it didn't do anything. I suspect it's from inside the lens.

Any help will be appreciated

⟐ Edited November 21, 2024 at 0:45 MST

Canon EFS 17-85mm lens: Lens not retracting after zoom in

Wed, 29 Jun 2022 20:49:29 -0700

Lens won't retract after zooming in. I have to push on the front of the lens to get it to retract.

⟐ Answered June 29, 2022 at 20:49 MST

Canon Lens: My 18-55mm lens is refusing to work on Auto Focus

Fri, 15 Nov 2024 01:15:03 -0700

I have a Canon 18-55mm lens that won’t function if its on Auto Focus. What could be the problem. Please help

⟐ Edited November 15, 2024 at 1:15 MST