Its not often I get excited but this discovery has had me blowing my techy beans all over the place. There is available a 4.2mm Lens that reduces the distortion created by the normal Gopro lens and sounds fairly easy to change and cost next to nothing to boot. The lens can apparently be used in all shooting modes and can still be interchanged with the original lens although after fitting the new lens the Gopro will not fit into the waterproof case. Im sure the lens can be changed to fit this though.

To change the lens the Gopro needs to be opened up, the original lens removed by unscrewing and the new lens screwed in and the focus set to between 5m and 10m. I have ordered one of these lenses and will post a small tutorial on how to change over.

Some numbers and stuff.....

• Focal length: 4.2mm
• F number: 2.8
• Distortion: -4%
• Diagonal view angle: 78 ° and 60 ° at 720p at 1080p
• Thread: M12x0.5
• Vapor-deposited IR block filter at 650nm      

The lenses are made by a firm called Sunex http://www.optics-online.com/default.asp and can be purchased through these guys in Germany, (who I bought mine from). http://www.globe-flight.de/GoPro-Wechselobjektiv-42mm-78-60-mit-IR-Filter

Take a look at the film they produced flying an RC Octokopter fitted with a Gopro and the new lens.