I disagree, an 8mm lens is an 8mm lens, no matter what it is used on. If you have it on an APS sensor camera, it's a wide angle/fisheye. But if you have it on a 1/2.5" sensor it's a telephoto. The 35mm equivalent is a handy way to figure out what field of view a certain lens will give you. It's up to the photographer to learn the medium. On medium format 6x6 or 645, an 80mm is considered normal. On 4x5 film, an 125mm is considered normal. Like the commenters before me, it is not a crutch.