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I can't get my canon 50mm 1.8 lens off my Canon 40D camera. The release button works and allows the lens to turn but I don't think it is rotating far enough to release the lens. Thanks, DAVE

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Make sure any movable rings on the lens are in the proper position. Also, try moving the AF and Manual focus setting on the camera.

Posted on Sep 08, 2010

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Posted on Jan 02, 2017

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52mm lens stuck on body,,how do you unstick it?


Normally, these lenses do not 'unscrew'. When you push the red button, it releases the lens catch and then you rotate the lens a short ways counterclockwise, then gently pull forward on the lens while holding the body of the camera and the two units separate. It is possible you have gotten some dirt into the lens latching mechanism. Try returning the lens to the locked position, press the red button, rotate the lens to where it stops and then returning the lens to the locked position and repeat several times if the lens does not lift out when you hit the movement stop. This may allow you to get past the dirt. Otherwise, take it to a camera shop, particularly if the camera is still under Canon warranty.

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I cannot get my new 50mm/1.8 lens off of my Rebel XT. PLEASE help!


Make sure you're holding down the lens release button, which is located on the front of the camera, while turning the lens. Sometimes a little bit of force is needed, I've found new lens' can stick a little bit. If it still won't come off, contact Canon.

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My canon 40D takes OK pictures on auto mode but, consistently over expose (+2) in manual modes. can not get AEB to slide to 0 or no exposure compensation....thanks.


First off the power switch must be turned to the position past "on" (this allows the thumb wheel to be used". Then while in any of the "creative zones" (except "M") half press the shutter then rotate the thumb wheel and this will allow you to move the AEB slider to your desired position.

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Maybe The Button Is Broken Chek The Button If It Still does Not work Let an Axpert Chek Your camera

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Try taking the battery out and putting it back in. If that doesn't work try cleaning the len's contact sesnors with a pencil eraser.

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1 Answer

Canon 40d error 99


Try the following diagnosis steps: -

To isolate the cause of the issue, do the following: -

1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 minutes.
4. Insert only a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.


Does the “ERR 99′ message appear? If so, the camera may be faulty and requires a service. If it does not, then: -

1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.


Does the “ERR 99′ message appear? If so, then the CF card is faulty. Try a different card. If the message does not appear: -

1. Turn off the camera.
2. Clean the gold contacts on the lens by GENTLY rubbing them with a pencil eraser or soft cloth. Keeping the camera face pointing down, also clean the gold contacts on the camera, being careful that you do not let any debris fall into the camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.
If the “ERR 99′ message only appears when one particular lens is attached, then that lens should be examined by a service technician.
If you see the “ERR 99′ with a different Canon lens attached, then the camera is faulty and should be serviced.

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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

Err99 40d canon body only


Try the following diagnosis steps: -

To isolate the cause of the issue, do the following: -
1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 minutes.
4. Insert only a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, the camera may be faulty and requires a service. If it does not, then: -
1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, then the CF card is faulty. Try a different card. If the message does not appear: -
1. Turn off the camera.
2. Clean the gold contacts on the lens by GENTLY rubbing them with a pencil eraser or soft cloth. Keeping the camera face pointing down, also clean the gold contacts on the camera, being careful that you do not let any debris fall into the camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.

If the “ERR 99" message only appears when one particular lens is attached, then that lens should be examined by a service technician.
If you see the “ERR 99" with a different Canon lens attached, then the camera is faulty and should be serviced.

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2 Answers

Canon eos 40D error 99


Check this link: www.richardsnotes.org/archives/2005/04/29/50mm-lens-contact-points/

Oct 20, 2008 | Canon EOS 40D Digital Camera

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