Canon A540 - Manual (Page 113)

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3
When the $ mark on the camera and the
mark on the ring are aligned, lift off the ring.
4
Align the ! mark on the conversion lens
adapter with the $ mark on the camera, and
turn the adapter in the direction of the
arrows as far as the $ mark on the camera.
! To remove the conversion lens adapter, turn the adapter in
the opposite direction with holding down the ring release
button.
5
Set the lens on the adapter, and turn it in the
indicated direction to attach it securely.