Question about Canon EOS 40D Digital Camera

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Mirror Lock-up? Tried to clean my 40d, took the mirror up, swtched off, and back on, but can't get the mirror back down .Any ideas?

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  • cos100 Feb 04, 2009

    Thank you for your help, I appreciate it. I have done what you suggested, but it had to go in for repair. It was with Canon for exactly a fortnight and is now back and fully working. Technician said they normally manage to get it working again on line, but not in my case.

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Try to take a photo. if the mirror don't back down, switch off one more time. If the problem is still there you will have to put your camera to repair

Posted on Feb 04, 2009

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Canon 40d will not take pictures


1) CF card in camera? Won't shoot without one

2) Does mirror go up?

3) Canon had a run of bad motors for this model - if mirror does not go up, then it is the mirror motor. If mirror goes up, shutter will not fire, press release again then the mirror goes down, the shutter motor is bad (same model motor). If mirror goes up, shutter fires, both blades travel together/no exposure, probably the shutter is bad.

May 07, 2012 | Canon EOS Digital Rebel XS / 1000D IS...

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Regardless of lenses,and batteries, cf cards, flash and exposure settings, when the fire button is pressed there is a small "click" and the camera freezes-no picture none of the exposure settings...


A few suggestions: The mirror lock up function has been activated. The sensor cleaning mode has been activated, doing this the camera as soon as you trip the shutter the mirror will come up and all other functions of the camera are inoperable. the mirror will stay in that position until it runs out of battery or you turn it off. The part you said about having to removing the battery doesn't make scents for this function though. Sensor cleaning is in the Custom Functions.
I know you said regardless of lenses and batteries how long do you wait before shutting the camera off and removing the battery? I know that's a question and we aren't suppose to answer a question with a question but the reason I'm asking is that the Canon 40D has a long 30 second shutter speed and a "bulb" setting. It is possible that the camera has been set to "AV" and the shutter is timing out, OR it's been turned to BULB and that mirror will stay there until the camera battery is dead before it drops. Couple things to check out before the next thing I'd think about is the amount of shutter actuation. The Canon 40D has a shutter good for 100,000 clicks/actuation. Sounds like a lot but if you are doing time laps or extended video it's very possible to blow the shutter out of these.

Dec 10, 2010 | Canon EOS 40D Digital Camera

1 Answer

Nikon D2X - How do you lower the mirror if it gets locked up by mistake ? Had an err message on the upper view screen, tried the repair from this site, by tapping the front leftside of camera front and...


Normally, you can manually lock-up the mirror for the purpose of cleaning the sensor. To do this, you need to connect the camera to the optional EH-6 AC adapter. If after removing the lens and inspecting the mirror, you cannot gently nudge it back down (do not touch it...use a cotton swab) then you'll need access to the EH-6. If you don't have one, possibly a camera store near you would have one and be willing to let you plug in your camera so you could try to access the mirror lock-up function in the set-up menu.

Nov 08, 2010 | Nikon D2X Digital Camera

1 Answer

I can't get a clear image. there is always a haze!! What can i do?( i have had other photogs try and shoot with it as well to make sure it wasn't just me)


The mirror and/or sensor is probably dirty. Try cleaning the mirror. If you're not sure how to clean the mirror, it's best to take it to a camera dealer who will do it for a fee. The mirror can scratch if you're not using the right camera cleaning equipment and cloth/lint-free lens tissue. So it's best to pay a trained person to do it for you.

Nov 13, 2009 | Canon EOS 40D Digital Camera

1 Answer

The mirror is not moving when I take a picture,


Same thing happened to me also, I took out the battery and card for a few minutes, inserted it back in and it started working again.

Oct 29, 2009 | Canon EOS 40D Digital Camera

1 Answer

I have a 99 error screen appears on my camera please help


I had the same problem with my 1 month old 40D! My temporary solution (though I already got a replacement) was to set the camera to P mode, and go to the Sensor Cleaning mode.. Choose Manual Mode, and clean now... Err99 will appear. You have to switch off the camera and TAKE OFF the baterry for few seconds. Once reinstalled, you can hear the click of the mirror resetting itself. You should be able to snap foto as normal for now.. I guessed its one of those mirror lock up that brought up this ERR99 **** thing! It annoys me to do this everytime I use my camera... especially after few days didn't use it..

Aug 19, 2009 | Canon EOS 40D Digital Camera

2 Answers

40D turns off as I press shutter button


The shutter mechanism had to be replaced. I've heard that this is a typical 40D problem, due to a shutter design flaw. They say that it has been fixed on replacement shutters.

Jul 26, 2009 | Canon EOS 40D Digital Camera

1 Answer

Anon 40D, can't lock ocus when press shtter button halfway ! Please help ! TIA


make sure you are not on MF mode. also, check c. fn's for mirror lockup or anything else that might affect AF, including modes

Jul 15, 2009 | Canon EOS 40D Digital Camera

1 Answer

CAMERA IS THREE MONTHS OLD. ON MY LAST OUTING I NOTICED A PERFECT CIRCLE SPOT ONLY IN SHOTS OF THE SKY. THE SPOT IS IN THE IDENTICAL PLACE ON ALL SKY SHOT PHOTOS NO MATTER WHAT FOCAL LENGHT IS USED. THE...


If you have another lens, switch it and take some shots of the sky. If the spot is gone, it probably was the lens that needs cleaning/servicing. However, it's more likely that there's dirt on your CCD. On your camera's menu, select mirror lockup/clean CCD (I can't remember the exact terminology but you get the idea).

After you select that, the mirror will stay up. Remove the lens and you'll see that the CCD is now exposed. Use a blower (don't use your mouth to blow as you will end up with spit in the camera) to clear out any dust/debris on the CCD. Don't touch the CCD.

Turn off the camera and you'll hear the mirror go back down. Re-attach your lens and try some shots.

Apr 13, 2009 | Canon EOS 40D Digital Camera with 28-135mm...

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