Amazon.com : Optics 2.0X High Grade Telephoto Conversion Lens for Canon Powershot G9 (Includes Lens Adapter) : Electronics
58mm Camera Filter Adapter Tube Ring Metal Adapter Ring for Powershot G9 G7 | eBay
Canon PowerShot G9 - Wide Angle Lens
Amazon.com : Fotasy Manual NK Lens to M4/3 Adapter, F Mount to MFT, Compatible with Nikon F lens Panasonic G7 G9 GF8 GF90 GH5 II GX7 GX9 GX850 G90 G91 G95 Olympus
Lensmate and Canon Adapters for the G9 - Light Description