My 40d has this same issue. I have a 20d to trial my lens on and it works perfectly, the 40d however, is exposing about 10 stops too high and the flash deploys even when you are aiming at the sun. The visual idea is that the metering system shows very low light. I reset everything to no avail. Do you think that the metering system needs to be replaced? Is that even remotely doable?
The Auto modes on the 40D weren't very reliable when I ran comparison tests with other models..and systems. In fact I gave up with the 40D altogether! :) The anti-aliasing filter was a joke and the auto focus was....blaaah.
You mentioned you 'reset everything'? Yet it sounds like there may be some residual settings left behind. EG, white balance settings, flash sync speed. You might also want to check the individual presets for LANDSCAPE, PORTRAIT, NATURAL etc... Once you can start afresh, things should start to make sense as you make adjustments. Just remember to keep account of what adjustments you make.
CF (custom functions): are normally reset to factory however some settings remain (white balance adjustments, tonal adjustments etc)
I have a 20d and a 40d. The 40 is reporting to the viewfinder that it needs more light, even when the sun is the object. It's like that in all modes including manual. I got this camera 6 months ago and then it worked reasonably well, over the last month I have this issue. The 20d doesn't have it so I moved my lenses to it while I attempt to get this 40d fixed.
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SOURCE: "busy" Error
check your firmware version and update if necessary. Usually you get the "busy" message when your camera is writing to the card and it's possible the card isn't quite right - a format should fix it. Alternatately you might try a different CF card to see if the problem goes away. Good luck!
SOURCE: Lens won't retract
Lens errors are fairly common. Usually it's sand or grit interfering with the lens extension mechanism. Or the camera's been dropped with the lens extended. Or the camera has been powered on, but the lens had been blocked preventing its extension.
Here's some things that you can do to try to correct it. They only seem to work for about 50% of lens errors, but they're worth a try:
http://camerarepair.blogspot.com/2007/12/fixing-lens-error-on-digital-camera.html
SOURCE: Canon 40D LCD Wont come on buSY flashes in view finder
Okay, this is simple. Your camera can take several pictures at one time in a burst. However when you release the shutter button your processor takes a second to actually SAVE the pictures to the card in the camera. One thing than has helped me in my wedding photography business is to buy the fastest speed cards I can find. It significantly reduced my "busy" time.
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