uhh...0.5x is pretty wide man. .43 or .42 is the general fisheye effect. but it also depends on the focal length of your camera as to how much vignetting(if any) will show up. heres a picture of my .43 (ignore hte searchbar noob thing hahaha) if your looking to film skiing id go with a 0.3 wide angle but for skateboarding, .43 is the way to go...if you cant afford a death lens haha