Camera functions normally in auto mode but not able to focus in manual mode due to viewfinder being out of focus, if camera tilted back viewfinder now comes into focus
There's a diopter adjustment knob above and right of the viewfinder. Turn the knob while peering through the viewfinder until it comes into focus.
Testimonial: "Not the mirror that is loose but an internal optic part of viewfinder, have taken into a company to ship camera back to Canon U.K for repair. many thanks for advice."
SOURCE: Auto Focus Not Working
I had a same problem, Auto Focus works in all the Basic modes but it did not work in Advanced and Manual modes.
After couple of hours of frustration I found the solution. It worked for me, I hope it will work for you too.
Follow step by step instructions.
Start the Camera
Go to M (Manual Mode)
Press Menu Button
Go to 6-th Tab Custom Functions (C.Fn)
Select Clear settings
Select Clear all Custom Func. (C.Fn)
This should fix your problem
Go back to shooting more and try your Auto Focus
SOURCE: Digital Canon Rebel DS6041 - Auto focus does not working
allow to dry for an extended period. leave lens off, put in dust free area.
it may 'come back' after a few days of being open.
moisture can cause malfunctions. is sensor clean a liquid? or air?
air can be driven by a propellant which can cause problems.
try removing battery if it does not come back, or maybe before.
good luck, otherwise, time for service'
mark
SOURCE: Canon digital camera will not focus
Check your diopter adjustment. It should be a small wheel on the upper right of the viewfinder. It is designed so that people who normally wear eyeglasses can use the viewfinder without their glasses, but it can occasionally get bumped. If the diopter adjustment is way off, it is like looking through someone else's eyeglasses!
SOURCE: My Canon EOS 1000D wont take photos, viewfinder flashes busy
Maybe you drop your battery and they have electronic components inside that could be spoiled, if is that the case, try to change the battery, it appeares to me that the ammount of current the battery is sending to the component is very low even thoe it seems to be fully charged that's why the camera is unable to display anything and the "busy" warning is blinking all the time, I hope you find this usefull.
SOURCE: The viewfinder on my Canon PowerShot SX20 is blurry
Check the diopter adjustment on the left side of the viewfinder.
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None of the suggestions will help, if you view through the view finder whilst holding the camera and aiming upwards at about 45 degrees view finder is clear, as you bring the camera down to normal postion you can hear a sound of the optic element moving (almost like it has come free from it mounting) and then the viewfinder becomes blurred. Have scoured the net looking for any info on the viewfinder assembly but either i am looking in the wrong place or it is one of life's greatest secrets. I just need advice if this is a service repairable item or should i just bin the camera and start again?
In that case it's most likely that the mirror is loose. Remove the lens. While looking into the opening in the front of the camera, aim the camera upward and then rotate it level. Does the mirror move? If so, it's loose. A good camera shop should be able to repair it.
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