Question about Canon 35mm f/1.4L EF USM Autofocus Lens

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Autofocus function will not work on Canon 17 40mm 1.4 EF lens

I am us using a Canon 20D EOS body with a 3yr old Canon 17 40mm EF lens that has all of the sudden quit working with the autofocus feature. Other Canon lenses work with the body so I have narrowed it to only this lens. Light meter does work under Af mode. I have made sure that the digital sensors are free of any "gunk" and have been careful when changing lenses and recapping as well. If I am looking at replacing a sensor, will it require replacing the entire sensor pad and is it worth the possible repair costs?

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Since the problem is limited to this lens, I highly doubt that you would have to replace the cameras AF sensors.
Since you only have the problem with this lens, I am afraid that you will have to get the lens repaired. Is the lens also 3 years old? Did you get it with MACK extended warranty?
Sometimes, Canon do these kinds of repairs for free, if they discover that there was some manufacturing error that caused it to fail. So be sure that you get it to a certified canon workshop. 
I hope this helps, 
/Chris

Posted on Jan 20, 2009

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Posted on Jan 02, 2017

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My canon eos 300d will not lock onto autofocus, no matter which lens I use. Consequently, cannot take fotos using "A/F". (Works ok on Manual Focus) Help!


Clean the contacts on the camera body (and the lens, too) where they meet with a cotton swab lightly dampened with rubbing alcohol.

Oct 12, 2011 | Canon Digital Rebel / EOS-300D Digital...

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I just received the canon EF 100-400m lens for Christmas. I was using it on my canon EOS 20D and it just shut down. I thought I had a dead battery but even after charging the batery, I couldn't get my...


I've had this happen right in the middle of a shoot, what I found first was that I had pushed the lens release button and the lens moved ever so slightly but enough to mess up the connections and everything went dead. Another thing is not having the battery at a full charged but if it's not coming on at all I'd be checking the battery door make sure it's latched securely. Next make sure the Card is down and locked in the seat and the card door is closed and locked. Clean the contacts on the camera body and lens (this generally gives an error 99 though) with a red soft pencil eraser keep the lens as vertical as possible when lightly cleaning (polishing) the lens contacts. Keep the lens cavity pointing down as much as possible while cleaning (polishing) the body contacts another thing and my 20D is coming due for this as well is a back up battery this replacement is found on page 35 of your manual Oops not manual here is a diagram
Diagram
tri3mast_200.jpg
Here is where to look and what to do diagram
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This should put you back into the photography again Cheers Have fun with that great lens

Jan 17, 2011 | Canon EOS-20D Body only Digital Camera

1 Answer

My canon 20D autofocus doesn't work... can you tell me haw to do?? thanks..


Make sure your camera is set to Auto mode (top left knob). Check your lens and make sure it is switched to "auto" and not "manual"(sliding switch near base of lens). Make sure your lens can rotate and move without being obstructed. Clean the lens contact by removing the lens and use 99% alcohol or lens cleaner sparingly to clean off the metal contacts.
You can also check your viewfinder focus, it has a small dial upper right, that you can fine tune to focus to your own eyesight. If it is way off, your view will always appear to be out of focus.
Hope that helps.

Dec 29, 2010 | Canon EOS-20D Body only Digital Camera

1 Answer

If I buy a Canon EOS 500D body wil my 500n AF lens fit it and operate OK?


All canon EF and EF-S lenses work with 500D /T1i model.(yes all)
If your lens is removed from old 500N body and if it has EF marked it will work for every Digital camera model of canon.
Note: its focal length will be multiplied by 1.6 X factor.
(mean 18 mm lens will become 29mm approx.)
If you find this of help rate me.

Nov 23, 2009 | Canon EOS 500D / Digital Rebel T1i Body...

1 Answer

00 on the F info (aperture shows 00)


I'll assume the lens is an AF lens? Most of the new Canon bodies require AF contacts. If there isn't the right contacts, it won't work. There are suppose to be AF body mounts that will tell the body that there is an AF lens, then use the old lens in Auto mode.
If it's an AF lens, the internal electronics are toast. You could send it out, but they'll charge you a "look at" fee. That could run into many bucks. Give Canon a call.

Jul 26, 2009 | Canon EF-S 17-55 f/2.8 IS USM Lens

1 Answer

New Camera


Get the Canon EF 70-300mm IS USM about $500 and EFS 17-85mm IS USM about $300. The 75-300 all of them I would not use them 4 a body cap. Camera is fine or step up to XSI.

Jun 10, 2009 | Canon Zoom Telephoto EF 75-300mm f/4.0-5.6...

2 Answers

Will a quantaray 28-105 1:3.8-5.4 Zoom lens Autofocus from a 35mm rebel ti fit on Canon EOS Digital Rebel 6.3 MP 300D?


The 35mm Rebel Ti and the Rebel 300D use the same lens mounting protocol. All Canon cameras designated 'EOS' use the autofocus EF lenses. If your Quantaray lens worked on the Rebel Ti, it will fit and should work on the Rebel 300D.

Mar 19, 2009 | Canon Digital Rebel / EOS-300D Body only...

1 Answer

Hi all, I wonder if you can supply some advice regarding a Sigma17-35mm lens I purchased earlier in the year. Basically if I use the automatic or 'P' setting on my Canon EOS 30D camera the image is over...


Try your EOS in AV (aprature value) mode. You should be able to adjust your aperature value in 1/3 or 1/2 steps dependind how you have your Custom Functions set in your camera's menu. Possibly the lens you purchased is for an EOS 35mm. If you use a 35mm lens on your eos there are some calculations you must use. When using a 35mm lens on the EOS 20D, 30D, 40D and 50D bodies, you must first calculate your focal leingth by 1.6 times. With this, your exposure changes as well.

The only EOS Digital SLR bodies that use a 35mm x 24mm CMOS sensor are the 1D and 5D. My wife uses a Tamron 18-200mm f3.5-5.6 lens on her 20D and loves it.

If this makes no difference, you may have a defective lens.

Nov 29, 2008 | Sigma Cameras

1 Answer

Cannon lenses


All canon EF lenses (and compatibles e.g. Sigma EX) can be used with both analog and digital  EOS-bodies. Depending on the sensor size (usually smaller than a 35 mm negative) a crop-factor due to the smaller field of view must be considered.  Example: Canon EF 50mm/1.8 lens used on a digital EOS (40D, crop factor 1.6) equals a 80mm lens (50mm x 1.6) compared to analog cameras using 35mm film. Some digital EOS-models can also use EF-S lens-series.

Nov 28, 2008 | Canon EOS 40D Digital Camera

1 Answer

Manual Focussing failure with Canon EF 100-400mm SLR zoom lens


I doubt if there is anything you can do yourself. The manual focus may have debris under the ring or is in need of parts. I would leave this one to a tech.

Jan 22, 2008 | Cameras

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