Blog — security cameras

fixed lens camera, is a camera lens with a fixed lens which you can't adjust the focal length, angle of view and also level of zoom. but almost of all fixed lens cameras are wide angle and also smaller than varifocal cameras. varifocal lens cameras,  is a camera lens with variable focal length in which focus changes as focal length (and magnification) changes, as compared to parfocal ("true") zoom lens, which remains in focus as the lens zooms (focal length and magnification change). Many so-called "zoom" lenses, particularly in the case of fixed lens cameras, are actually varifocal lenses. Usually the...