I want to buy a fisheye for this cam http://www.testfreaks.se/videokameror/toshiba-camileo-h20/ but i have no idea wich one will fit on it. On the front of it there is some wierd numbers f=6.8-34mm 1:35-3.7 i have no idea what that means ^^ i watched a few vids and the only one that i could find who said something about the size said there should be like a 42-40mm or someting.
"Camera Magnify Power: 0.43x" from the Amazon ad. I believe what they are indicating there is the amount of magnification you get with that lens. For example, a 1x lens will project an image onto the film plane at actual size (macro lens). A number less than one means it will project stuff onto the film plane larger than actual size, which I guess is what you want with a fisheye. (note: I’m not sure if “film plane” is the correct terminology for a video camera, or even a digital camera–that would be image sensor)
The f would normally be for f-stop; basically the amount of light the lens lets in. But you followed it with mm, which usually refers to the focal length of the lens. Shorter focal length is wider, longer focal length is more of a telephoto.
Feel free to correct me on any of that if it’s not right for video. And somebody figure out how to turn this into a unicycling thread…