In photography, a lens hood or lens shade is a device used on the front end of a lens to block the Sun or other light source(s) to prevent glare and lens flare.[1] Lens hoods may also be used to protect the lens from scratches and the elements without having to put on a lens cover.
The geometry of a lens hood is dependent on three parameters: the focal length of the lens, the size of the front lens element and the dimensions of the image sensor or film in the camera.
- ^ van Walree, Paul. "Lens hoods". Toothwalker.org. Archived from the original on 2012-03-31. Retrieved 2011-05-18.