Question about Canon EF 17-40mm f/4L USM Lens

2 Answers

Soft ratcheting noise when focussing

Just took delivery of this unit ,and put it on my 350d press the button an i can feel and hear the focussing motor moving the inner lens ,this appears to be notchy and unlike any lens i have had before, can someone tell me ,is this normal?

Posted by on

2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 17 Answers
Re: soft ratcheting noise when focussing

I've had mine repaired out of a center in New York. they did an excellent job. Replaced the servo and internal focus ring. It is an inexpensive lens but can be repaired much cheaper than replacing it. if you don't shoot 10s of thousands of pictures a year or can live with a little less than professional quality...and don't have the money, the repair of the beast is a good alternative.

Posted on Feb 04, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has answered 200 questions.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 216 Answers
Re: soft ratcheting noise when focussing

Yes, most are like that.
Canon is making a killing with lens: 17-40/4.0L; 24-105/4.0L and those EFS lens.
You've purchased about $800.00 and have a 40/F4.0, that is very slow.
This is a cheaper L lens and at lower cost.
The better model would be 16-35/2.8L II, but the cost is high.
Send it back and pray that they will give you an exchange.
Or better, asks for the upgrade: 16-35mm/f2.8L II. This lens will hit you around $1,700.00.

Posted on Dec 29, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Picture is blurred

Any weird noise ? Is your camera old.. it must be focussing problem . It can be die to lens or poor light and contrast

May 14, 2014 | Fujifilm Finepix Jx550

1 Answer

Fault finding

some of the older sigma 70 -500 lenses had a little rubber belt driving the focussing. you can access this by removing the mount ring, four screws and two on recessed on the side holding the contact also three screws holding the centre black cover. the belt used to stretch therefore no longer driving the focussing ring.

Aug 18, 2013 | Sigma Camera Lenses

1 Answer

Tokina canon eos 350D error 99

1.Remove the battery, lens and CF card. Allow the camera to sit without power for 20 minutes and then reinsert a fully charged battery.
2.Turn the camera on and push the shutter button as if you were taking a picture.
3. If you don't get the error message reattach the lens and insert the CF card.
4. Check the below canon eos 350d service manual link:

it will help you to save a lot of money
Hope it helps, Thanks

Apr 08, 2013 | Tokina AT-X 124 PRO DX Lens for Canon

1 Answer

Canon EF 100-400 not auto focusing

It is probably a broken ribbon cable in the lens. It will need to be replaced.

Dec 18, 2012 | Canon EF 100-400mm f/4.5-5.6 IS USM Lens

1 Answer

Help with focusing with 7d

What is the focussing problem?
The EOS 7d is usually an autofocus camera with a 19-point
focussing system.
Are you trying to override the focus manually?
This is not recommended.
Much of the purchase price is based on the speed and
accuracy of the focus.
Please restate your problem with more detail and information.

Aug 29, 2011 | Canon Camera Lenses

2 Answers

"Lens error" in body EOS 350D


The problem is that the lens has become stuck in the barrel. There are some DIY solutions you could try, but the probability is that you will have to get it fixed by a professional.

Use these at own risk as it may further damage the camera.

Firstly , try connecting your ac adapter or usb cable.

Try holding the shutter button while switching on the camera.

Look at the lens , and if some of the lens 'circles' is misaligned or not concentric then try wiggling it (while holding camera lens down).

Try gently pushing or pulling the lens when it extends but this is risky as it may cause the lens barrel to slip out of its guidance system.

Another way to do this is to place the camera lens down on a hard surface and then power it up. Be sure to use a soft cloth or something similar as to not scratch your lens or casing. Let the lens push the camera up and down a few times and sometimes the little resistance provided by the camera is enough to get things going again.

Try hitting your camera near the lens on the body with the soft tissue on the palm of your hand.

Other than that , I would take the camera to a repair centre for a evaluation to see if it would cost more to repair than to replace the camera.

If it is still under warranty I would suggest you take it in before trying any of these steps and remove any off-brand batteries or accessories as some stores are really fussy about warranty repairs on camera's with non-brand accessories.

You can also have a look at THIS link.

Hope the advise is useful. please do not hesitate to let me know if you need any further assistance. Also, please be so kind to let me know if you found this helpful.


Jan 27, 2011 | Canon EF-S 18-55mm f/3.5-5.6 USN Lens

1 Answer

I have the canon 50D and the 24-105mm L lens. Yesterday i took some images, and it worked fine. Today the auto focus is not working. When i press the button half way, nothing happens. If while i'm pressing...

This to me is a connection problem and may only require moving the AF-MF button back and forth a few times or removing the lens and cleaning the contacts between the lens and camera body.
Generally the "L" series lenses are pretty resilient in construction of offer the user few problems.
The lens contacts can be cleaned with a soft red rubber pencil eraser where you lightly polish the contact area of the gold contacts. Clean away any rubber dust with a lens cloth not a tissue, be extra careful not to get dust into the camera body cavity. reassemble the lens and try the camera lens operation
This should clean up the problem

Jan 20, 2011 | Canon 24-105mm f/4L IS USM EF Lens

1 Answer

I have Cannon A-1 and F-1 Camera bodies, plus all Cannon FD lens. Can I buy a new Cannon digital camera and use a special adapter and use those older FD lens. I would appreciate any reasonable input. JD

No. The only adapters you can get either lose infinity focus or need corrective optics (expensive and reduce image quality) to preserve infinity focussing. The lenses will need to be manually stopped down for metering purposes and the body will only be able to use manual and aperture priority modes.

Also, with modern computer designed optics, using FD lenses on a modern digital SLR is like screwing an old glass bottle on the front and hoping to get sharp images. An exaggeration, perhaps, but you will get significant edge softness and chromatic aberrations and the contrast will be lower than acceptable and truly dreadful with optically corrected adapters.

Sep 27, 2010 | Camera Lenses

1 Answer

I am wil from jamaica. have 18-55 canon any time i put it on the camera i get erro 99 I want to know what to do.

Please attache lens to your camera and set your camera to AV mode and set max. appeture 22 or more and front right side of camera there bottom edge of lens mount ring there is small black button.
press that button with shutter button and put your camera under light and press both button and check lens shutter is opening and closing properly if not and you getting err99
then lens diaphrm unit is faulty you need to replace it.

Aug 05, 2010 | Canon EF-S 18-55mm f/3.5-5.6 USN Lens

1 Answer

Brand New EAOS 50D is telling me that communication between lense and camera is not working.

Sorry to hear about your Canon EOS 50 D. problem. The first thing I would check is to be sure the contacts on the back of the lens are clean and the corresponding contacts on the camera body are also clean. You can use isopropyl rubbing alcohol and a Q-tip to clean these contacts. If this fails to make the system work we will need to test the lens features. begin by turning the autofocus and the image stabilizer both off on the lens.Set the camera two the AV mode. Adjust the F. stop to read F-22. Look at down the front of the lens barrel as you press the depth of field preview button. Every time the button is depressed you should see the diaphragm open and close inside the lens it should do this as quickly as you press the button if it fails to open and close the problem you're experiencing is probably with the diaphragm control unit.if you find the diaphragm functions properly the next step would be to engage the image stabilizer again attempt a photograph if it fails then it's probably a lens related issue and I would contact Canon directly for war to service. You may also find that if you've purchased your unit locally that your local store or if it's been within a two-week period may exchange a product for you I would be happy to answer any further questions you might have feel free to contact me

Jan 11, 2010 | Canon EF-S 17-85MM F/4-5.6 IS USM Lens

Not finding what you are looking for?
Canon EF 17-40mm f/4L USM Lens Logo

Related Topics:

93 people viewed this question

Ask a Question

Usually answered in minutes!

Top Canon Camera Lenses Experts


Level 2 Expert

246 Answers


Level 2 Expert

112 Answers


Level 2 Expert

371 Answers

Are you a Canon Camera Lens Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides