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Canon 40d Autofocus confirmation light damage

Canon 40D autofocus sensor confirmation lights in viewfinder have become very dim, some almost do not light at all.

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1 I suppose this is related to hardware problem.
2 May be the focusing screen is misaligned somehow.

Posted on Mar 07, 2008

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I have a Canon 40D and have never replaced the original lithium battery as someone told me that rechargeable Li - ion batteries don't have a lifespan. My picture quality isn't what it use to be...


The battery does not affect the picture quality. The recharageable battery may affect the auto focus if the battery is low, recharging the battery should fix this problem. Otherwise the camera needs a service.

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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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This is just a possibility not really a solution: If the AF spot is aimed at a part of the picture lacking details, it cannot focus (all cameras are the same in that respect) Normally (I don't know the canon) there is an indicator to tell you if the camera managed to focus. It can be a beep or a dot which light in the viewfinder. I suspect that in your case you were aiming at something lacking details.

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Autofocus has failed on the CAnon EOS 40D. I can power the camera up with lens in manual but as soon as I go to autofocus it becomes unresponsive. The viewfinder goes black. Swapped batteries and lenses....


It's not the Autofocus, there's no 'non-engineer' fix. Lens and slider have failed, it's basically broken inside and I suspect it was the original fault. It's about £160-200 outside of warranty to fix via a canon authorised repair agent such as www.camera-repair.co.uk in Colchester. Send it back, get your money back.

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1 Answer

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Hi poseguerai, 
Try this:
I had the same issue and even if it sounds crazy giving a massage to the shutter button all around in circles helped and when you switch on the camera has no shutter lag again.
I hope it works as it did for me.

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My 40D cannot start up. There is no response when I push the On/Off button. It remains the same after changing to the full-charged battery which came with the camera.
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1 Answer

Canon 400d constant backfocus


Backfocus problems will be magnified when using wide aperture lens with shallow depth of field, nice lens btw. Camera's adjustments for manual and autofocus are inside mirror cage behind mirror, and you dont want to risk getting dust on sensor or damaging sensor. Qualified camera repair shop or sending to canon for adjustment would be my suggestion.

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