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Re: error 99 or 90
My old 350D canon gave err 99 (in its last days) whenever I was trying to take photo with its built in flash.With out flash it stillworks ok.(so i left that).This is not Bower's fault for sure.(although bower is very dumb flash)
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try cleaning the contacts on the bottom of the lens, where it mounts to the camera body. This is a simple step to take and one that I try to remember to do frequently when I am switching back and forth between lenses frequently. get a magnifing glass and look closely at the contacts on both the lens and body. I have 5 canon bodies and the 75-300 IS lens is one of my favorites. It is ALWAYS mounted on either an XTI or XSI and within arms reach at all times. I have a hook and hang it from the headrest of the passenger seat when driving so that it is always ready at a moments notice. I have never had a problem with that lens.
Does the light flash for 10 seconds, with a series of beeps getting faster before the picture is taken so you miss the shot, or are you saying the shutter stays open for several seconds giving you a whiteout picture?
If the former, then the self-timer is on. Press the button on the back of the camera to the
right of the displays just under the AV button. The display icon will
change from :-
Hand sweeping round clock = self timer mode
Simple square = single shot mode
Stacked squares = multi shot (keep finger pressed to keep shooting)
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.