Question about Canon Digital Rebel / EOS-300D Digital Camera with EF-S 18-55mm Lens

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I have a canon EOS 400D and when i turn it on it works fine but when i start to use the flash it doesn't flash i get on the screen ERROR 99 ! what do i do ?

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ERR99 means the camera is not communicating with the lens - probably just dirty contacts.

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.

Posted on May 11, 2009

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1 Answer

My name is Madhu. I use the camera Canon EOS 400D / Digital Rebel XTi. When the inbuilt FLASH is on then a message pop up as "busy now", when i tried to click the camera to take a photo then...


Welcome to Fixya
Err 99 could mean several different things, such as... Memory Card, Lens or Lens contacts....

Here's what you can try:
Remove the memory card an enable "shooting with out memory card" and see if you still get the error. If it works your memory card is bad. Try another lens if you can. Clean the lens contacts with a pencil eraser (be careful not to get eraser dust in the camera body or in the lens). Worst case scenario is, Err 99 could be related to the shutter failing which would mean a trip to Canon.

Thank you

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Canon eos 400d error 99, shooting not possible. turn the power swithch on off again or re-instal the battery. It has been doing this for a long time and nothing is working to fix it! Thank you,


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 400d service manual link:
http://goo.gl/LHYVAy

it will help you to save a lot of money
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Error 99! Wont' take picture, the message states


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I have a canon eos450 that showsan error99 when on automatic. It seems to be related to the flash being released when going to use the camera. I is fine on the other functionsPV AV etc but not where the...


Error 99 is a generic error code and only Canon can diagnose it. But given that it occurs when the flash is set on, it must mean there is a fault with the flash circuit. You may need a technician to replace or repair the circuit. Alternatively, you could purchase an external flash if the first option turns out expensive.

Mar 29, 2009 | Canon EOS 400D / Rebel XTi Digital Camera

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Error 99 in EOS 400D


Here is a link which may help you.
http://forums.dpreview.com/forums/read.asp?forum=1031&message=9598105

It may be that the contacts on the lens is dirty, follow the directions, by using a clean pencil eraser (I would also suggest to use alcohol and clean the contacts after using the eraser). Also to remove the date button battery and the other batteries, then turn on the camera (with all batteries removed).
Then put the batteries back in.

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The camera is working again. I took out the battery, with the the on/off switch, off. I then swtiched the On/Off switch On. I then put the battery in ,and the camera turned on.It then gave me an ERROR 99. I then switch it off and on again, and it is still working.

Apr 28, 2008 | Canon EOS 400D / Rebel XTi Digital Camera

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Error 99 in canon 400D


You will get that error when using some lenses other than Canon. A lot of the older Sigma lenses have that issue. Do you get this error when using newer Canon EOS lenses?

Apr 01, 2008 | Canon Digital Rebel / EOS-300D Digital...

1 Answer

Canon error code 99


Your camera performs a quick 'integrity' check before each shot and goes into error 99 mode if the lens in incompatible or has a diaphragm problem. ( it will also display e99 if the shutter or flash unit is not ok but this does not apply here ). This is how you can check whether the diaphragm mechanism is ok : attach lens to your old camera and set camera to AV and set F stop to 16 . open back and release shutter and look through the back to see if your lens is closing to F 16. If it is closing fine then the lens is ok but is not compatible with your D400.

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