Question about Canon Cameras

1 Answer

I have a Canon 20D camera that I use with two lenses. The lens that I have most of my problems with is the 28-70 f2.8 red ring lens. When focusing It always seems to focus on what is behind the subject. No matter how much I concentrate on the focusing sensor to focus on the subject -AND it looks like it focuses on the subject-UNITL I load my photos and look at them in disgust that it focused behind it!! What is going on?? I use the same lens on my friend's cannon 5D and NEVER have this problem. I need help! What am I doing wrong? Is this a common problem?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Expert
  • 56 Answers

This is quite a well known problem called 'back focusing' there is little that can really be done about it, except if the camera is under warrnty you can send it in and they will do some laser alignment that fixes the problem, it would be worth a call to canon and getting a price quote on a service. Also it seems to be worse with some particuar lenses,

Cheers

Emmanuel

Posted on Sep 12, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

What is error 99 in canon eos 20d


It's a frustrating catch all error and needs service.The camera may have any one of numerous issues or lens issues. If you have more than one lens, see if the error occurs with both lenses on. If not then it's a lens error. A camera repair facility can plug unit the camera and download a more accurate troubleshooting code. Royal Camera Service in Hanover Park, IL is good source for this problem. The replaced the shutter on my 20D when I got the error 99 code.

Feb 06, 2013 | Canon EOS-20D Digital Camera

1 Answer

I have sigma 70-300mm lens. But its autofocus mode is not working.please suggest solutions....what i can do?


You have not supplied enough information, however with the Sigma lenses here are a few things that could be a problem.

Is the switch from auto to manual focus set to auto focus.

Is the lens the proper mount for the camera it is installed on (meaning have you used an adapter to go from a Nikon to a Canon mount?) if so then there will be no electronic communication and the lens will only function in manual focus mode.

Is the lens compatible with the camera model? (meaning some newer cameras set the lens aperture in the camera while some older lenses set the aperture on the lens.)

Part 1 of 2 Have you installed an older "film" lens on a newer version digital camera?

Part 2 of 2 Have you installed a digital full frame lens on a Canon "S" mount with the APS size sensor with the 1.6 focal factor?

Have you changed the camera model to a newer Canon EOS

Have you updated the camera firmware recently?

Have you lightly polished (cleaned) the contacts between the camera and lens?
Have you received an error code 99?
Cleaning the gold contacts on the lens and camera body can be done with a clean pencil eraser and lightly polish the matting surfaces making sure no dust gets into the back of the lens or the camera body. Hold the camera lens mount down while lightly polishing the contacts same with the lens. Do not wipe clean with a facial tissue or use any type of liquid cleaner.

Also third party lenses like Sigma often do not have the compatible electronic "chip" to properly communicate with all Canon EOS cameras. Meaning if you had the lens on a Canon EOS 20D and then put it on a Canon 50D chances are it won't work.

Is the lens properly locked onto the camera body dismount and remount the lens generally solves this problem.

If non of the above isn't the problem then a trip to a repair center is needed.

May 03, 2011 | Sigma AF 70-300mm f/4.0-5.6 DL Macro Super...

1 Answer

I have a Tamron 28-200 lens for my Canon EOS 20D. My brother took it to Africa, and since it's return, the lens will no longer zoom out by turning the zooming ring. I spoke to another photographer who...


Some of the long tele's like that have some sort of locking mechanism on the side to prevent lens creep. Look for switches other than your aperature lock and auto focus/manual switch.

Mar 15, 2010 | Tamron 70-300mm f/4-5.6 Di Zoom Lens for...

2 Answers

Error 99 on EOS Canon 450D


This is what the people at the canon tech support say to do for error 99



read this!! :)

The guy at tech support listened and then told me that the lens contacts were dirty and to get a pencil with an eraser on the end, just a regular old pencil with a red rubber eraser. Detach the lens from the camera, hold it so that the lens’ gold contacts are pointing down and lightly erase their exposed surface, cleaning them of any hand oil that might have gotten on them.

Do the same thing with the gold contacts inside the camera body. This is a bit harder but it’s doable: just hold camera so lens opening points down so no gunk falls in. Erase lightly. I used a lens cloth and dabbed at the contacts rather than blow them so as not to blow the erasings inside the camera.

I did this to each of my three lenses just to be sure. Lo and behold, it worked



hope this works for you!!!! have a nice day!! :) :)

Dec 04, 2009 | Canon EOS 450D Digital Camera

1 Answer

My camera lense will not focus automatically or manually.


There is no battery in the lens.  The lens receives power from the camera. Whether or not the lens is getting power, though, you should be able to focus manually.
When you say you can't focus manually, do you mean that you can't turn the focusing ring on the lens, or that when you turn the ring the image does not come into focus?
If you decide the lens needs to be repaired, I recommend sending it to Canon.  You can go to their website (canonusa.com if you're in the US), click on support, and follow the links.

Dec 20, 2008 | Canon EF 70-300mm f/4.5-5.6 DOIS USM Lens

1 Answer

Hi there i have a auto focus problem. i used mt 50D for the first time on saturday, after about 100 shots Err99 appeared, i turned the camera off and took the battery out an the error message never occured...


The camera is having problems with your lens and this is why it goues into the error mode. Try first cleaning the interface contacts on the lens ( see enclosed pic ) . If this does not sort the problem out then the auto focus motor ( or related hardware ) inside the lens will need attention. Also try other lenses to see whether it is only the lens ( I very seldom see this sort of problem cause by the body ; it is always the lens that gives this sort of trouble )db49ae2.jpg

Nov 04, 2008 | Canon Cameras

1 Answer

Canon 20d - lens stuck / jammed


HI BRIAN ,,I AM SAGHA CAMERA REPAIRER,I THINK UR PROBLEM OCCURS DUE TO JAMMING OF PLASTIC MOUNT ON THE METAL BODY OF 20D.TRY THIS

1} LUBRICATE THE JUNCTION WHERE LENS GET ATTACHED TO THE BODY WITH KEROSENE THEN TRY TO RELEASE THE LENS.REMOVE THE BATTERY FROM CAMERA ,TRY AND HEAT UP THE JUNCTION WITH HAIR DRYER A LITTLEBIT THEN TRY TO RELEASE THE LENS.

2}IF THIS THING ALSO DOESN'T WORK THEN YOU HAVE TO SACRIFICE THE LENS PLASTIC MOUNT PUT SOME SHARP KNIFE LIKE OBJECT IN THE JUNCTION OF LENS & CAMERA & THEN PUSH IT UPWARDS WHICH WILL BREAK ONE OF THE PLASTIC LENS MOUNT COLLOR AND LENS WILL COME OUT WITHOUT DAMAGING YOUR CAMERA .LATER YOU CAN GET REPLACED THE LENS MOUNT FROM SERVICE PERSON. BUT NOW ATLEAST YOU CAN USE CAMERA WITH OTHER LENSES.

Sep 29, 2008 | Canon EOS-20D Digital Camera

1 Answer

Sigma 24-70 2.8 EX DG AUTOFOCUS PROBLEM


I would send it into sigma. They are in NY,
They are really quick about checking things out and I have neverhad them charge me to look at a lens and tell me whats up. aot of times they will just fix it while it there is it looks like something is worn out from normal use.
its a great lens. Some would say its a slower focus. than the Canon brand and you do get what you pay for but its hard to spend as much on canon lenses as they want. :)

Hope that helps,
Caleb

Jan 25, 2008 | Sigma 24-70mm F3.5-5.6 AF Zoom Lens

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

Not finding what you are looking for?
Cameras Logo

Related Topics:

66 people viewed this question

Ask a Question

Usually answered in minutes!

Top Canon Cameras Experts

kakima

Level 3 Expert

102366 Answers

TC CAMERA REPAIR.Com...

Level 2 Expert

165 Answers

old marine
old marine

Level 3 Expert

1814 Answers

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

Answer questions

Manuals & User Guides

Loading...