SOURCE: canon powershot s2
The E18 error is 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: E18 error on Canon ixus40 - lens stuck
The E18 error is an error message on Canon digital cameras. The E18 error occurs when anything prevents the zoom lens from properly extending or retracting.[1]
The error has become notorious in the Canon user community as it can
completely disable the camera, requiring expensive repairs.
A quick internet search for "E18" + "canon" quickly reveals hundreds of similar complaints.
ConsumerAffairs.com reports that the "lens has a feature called
bellows claw, which is a gear that physically extends and retracts the
lens. A piece that holds the lens, the barrier plate, is not large
enough and can sometimes cause the bellows claw to malfunction,
resulting in a stuck lens". The result is a black screen that only
contains the error message, E18. Another problem mentioned on the site
blames a sticky iris in the lens, caused by grease entering inside from
the microphones built into the lens. The buildup freezes up the ability
of the lens to open.
SOURCE: E18 Error message on my Cannon PowerShot A410
Lens errors (E18 errors on Canons) 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. Or the battery ran down with the lens extended ...
Here's some things that you can do to try to correct it. They only seem to work for less than 50% of the lens errors, but if the camera is out of warranty, they're worth a try:
http://camerarepair.blogspot.com/2007/12/fixing-lens-error-on-digital-camera.html
SOURCE: canon powershot s2 is lens won't retract error e18
Try tapping not so gently. other than that it will most likely need to be taken apart and put back together the right way. And any broken parts replaced.
SOURCE: camera shuts off after E18 error code
You have most likely dropped the camera or banged it against something while the lens was out. This situation causes the brass pinion gear to shear teeth off the plastic ring gear on the Inner Lens Housing. It may also cause the guide pins to jump their track. If this is the case the repair bill usually exceeds the value of the camera and you are probably better off selling it for parts on eBay and getting a new higher resolution camera.
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