Amazon.com : 58mm Two Piece Lens Adapter for Canon Powershot G10, G11 (an alternative to the LA-DC58K) : Camera Lens Adapters : Electronics
Canon Powershot G12 Quick Review: Digital Photography Review
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Check Out Lens Kit For The Canon Powershot G12, G11, G10 Digital Camera Includes 3.5X Telephoto and .43x Wide Angle Lens with Adapter Tube + 3pc High Res Filter Kit + BP
Canon G12 Review
58mm 2.2x Telephoto and 0.43x Wide Angle Lens for Canon PowerShot G12 G11 G10 | eBay