According to the focal length of the lens, what kinds of lenses are generally divided into? What is their focal length?

Fisheye lens: the focal length is below 10 mm;

Super wide-angle lens: focal length 12 to18 mm;

Wide-angle lens: focal length 18 to 28mm；;

Small wide-angle fixed-focus lens: focal length 35mm；;

Standard lens: focal length 50mm；;

Medium telephoto lens: the focal length is below 150 mm, and ordinary lens135 mm;

Telephoto lens: the focal length is more than 200mm;

Super telephoto lens: the focal length is more than 300 mm;

Note: The focal length of each lens recorded in different photographic books and materials is different. The fisheye lens is seriously deformed, the wide-angle lens is seriously deformed, and the standard lens is basically not deformed when it is close to the human eye. The medium focus lens has a slightly strong sense of compression, and the telephoto and ultra-telephoto compression are obvious.