The classification of lens focal length, which lenses can be roughly divided into according to diffe

The more common ones are 8mm, 15mm, 24mm, 28mm, 35mm, 50mm, 85mm, 105mm, 135mm, 200mm, 400mm, 600mm, 1200mm, etc., as well as up to 2500mm super telephoto telephoto lens.

Lenses can be divided into standard lenses, wide-angle lenses, and long-focal length lenses according to the length of their focal length, that is, the angle of view at the time of shooting.

The angle of view of a standard lens is about 50 degrees, which is the angle of view that a person can see without moving his head and eyes, and the feeling of viewing from a standard lens is basically the same as what we usually see. The focal length of the standard lens of a 35mm camera is mostly 40mm, and the focal length of the standard lens of a 50mm or camera is generally 80mm or 75mm. Digital cameras, on the other hand, have different focal lengths due to their imaging media (CCD or CMOS), and the focal lengths of standard lenses are also inconsistent.

For the sake of convenience, DC lenses often use the so-called equivalent focal length equivalent to that of a 35mm camera, which refers to the equivalence in the angle of view. The following is only a 35mm camera lens, other format cameras and digital cameras can be extrapolated.

In terms of focal length, do you know what are the classifications of lenses? I've read the long knowledge.

A standard lens is a general term for a lens with an angle of view of about 50 degrees, and a photographic lens in which the focal length and the diagonal length of the frame being photographed are approximately equal. The angle of view is generally 45° 50°. The 35 mm lens is a 40-60 mm focal length lens, the 6*6 cm focal length is a 75-80 mm focal length lens, and the 4*5 inch is 120-150 mm.

The standard lens sits between the wide-angle and telephoto lenses. The angle of view of a standard lens is comparable to that of the human eye, so the captured footage is very similar to what is seen with the naked eye. A wide-angle lens exaggerates the distance between the front and rear objects, while a telephoto lens compresses the distance.

The standard lens behaves more "normal".

a.The fisheye hall inspects the mirror and pretends to be the stove.

b.Wide-angle lens.

c.The standard lens is not rubber.

d.Medium telephoto lens.

Correct answer: ABCD

Fisheye lens: focal length 10 mm or less;

Ultra-wide-angle lens: focal length 12 to 18 mm;

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

Small wide-angle prime lens: focal length 35 mm;

Standard lens: focal length 50 mm;

Medium telephoto lens: focal length below 150 mm, common lens is 135 mm;

Telephoto lens: focal length of 200 mm or more;

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

Note: The focal lengths of each lens recorded in different photography books and materials are not the same, the deformation of the fisheye hall lens is quite serious, the deformation of the wide-angle lens is serious, the standard lens is close to the angle of view of the human eye and basically no deformation, the image of the mid-focus lens has a slight sense of compression, and the sense of compression of the long-angle and ultra-telephoto is obvious.