By attaching this spacer ring to the Canon LA-DC58C ring and then either the DCR-CF185PRO or DCR-FE180PRO to the front of this ring, you can now make use of the DCR-CF185PRO or DCR-FE180PRO 180 degree conversion Fishe Eye lenses on the Canon PowerShot Pro1 Digtal Camera, as the Canon LA-DC58C ring fits on to the camera.