Canon A590 IS - Manual (Page 182)

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3
When the button on the camera and the
mark on the ring are aligned, lift off the
ring.
4
Align the z mark on the conversion lens adapter
with the button 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 while holding down the ring release button.
5
Set the lens on the adapter,
and turn it in the indicated
direction to attach it
securely.