What do you think of camera lens parameters?

Lens is the basic unit of visual language. The classification of lenses can be classified according to focal length, aperture and lens telescopic adjustment. But many amateurs can't read the camera lens. Let's introduce the camera lens parameters to you!

Camera lens parameters

1, there are usually several data on the lens: focal length (segment) aperture \ closest focal length (many of them don't have this parameter now).

For example (for better explanation, this lens may not be available), the parameter of a lens is 18-50mm2.8-3.5m0-infinite (horizontally expressed as 8 characters), that is, the focal length of this lens is18-50mm, 18mm wide-angle end.

The basic parameters are the same no matter what brand. As for other words, such as USM and Macro, please refer to the descriptions of various brands.

2. For the lens, the larger the aperture, the better; Wide angle is more expensive than standard, and the focal length of the gun is more expensive (under the same circumstances); Constant aperture is better than non-constant, and there are many reasons for the lens, such as whether there is a dispersion sheet, metal or plastic, and whether there is a macro. There are too many influencing factors.

Generally speaking, wide-angle framing, medium-focus portrait shooting, telephoto shooting birds or sports occasions are just the most basic statements.

The simple choice is to look at your own use, and of course, the budget. Generally, your lens is expensive because of imaging quality and other problems. Knowledgeable people will look at evaluation and imaging curves and so on. It's hard to make it clear in a few words. It is best to know your purpose and budget, and then give you several choices, and then choose one by one.

AF-S: ultrasonic motor autofocus

DX: Nikon's APS frame

16-85mm:16mm to 85mm zoom lens

F/3.5-5.6: The maximum aperture is 3.5 at 16mm and 5.6 at 85mm.

G: g lens has no aperture adjusting ring.

ED: ultra-low dispersion lens

VR: lens anti-shake

Maximum aperture: 3.5-5.6 (the maximum aperture at the wide-angle end is 3.5; Telephoto machine 5.6)

Focus range: 18-200mm (lens size. Note that it is not the equivalent focal length)

Filter aperture: 72 (the larger this number, the better the lens transparency)

The meaning of common characters on camera lens

The letter a is engraved on the aperture of the lens. When the aperture is set to a, the lens will automatically adjust the aperture size in speed priority or program exposure mode.

The abbreviation of abnormal dispersion in AD English means that the lens is a high-performance lens made of irregular dispersion glass, which can better reduce dispersion.

AF stands for autofocus, which stands for autofocus.

The abbreviation of AFL autofocus lock stands for autofocus lock.

APO, the abbreviation of Apochromat in English, refers to double dyeing.

ASL stands for aspheric surface, which means that the lens is made of the best aspheric lens. This lens is compact in structure and can effectively control spherical aberration and distortion.

Telescopic leather cavity lens.

CAF stands for continuous autofocus. This is an autofocus mode that can continuously track the motion of the subject.

Cooklinskirk lens is an astigmatic lens with the simplest structure.

The abbreviation of CIF English Catch in Focus refers to trap autofocus. This is an interesting way to focus. The photographer sets the distance of the subject in advance. Once the subject enters the preset distance range, the camera immediately opens the shutter, just like digging a trap to catch prey when hunting. This focusing method is often used in sports activities and animal photography.

Di, the abbreviation of English Digital, means that this kind of lens is suitable for digital cameras.

Double Gaussian lens is a kind of symmetrical portrait lens with large aperture.

ED English abbreviation for Extraiow dispersion, which means that the lens is made of loose glass with super background color. Dispersion and distortion can be minimized.

F (focal length) refers to the focal length of the lens.

A fisheye lens refers to a fisheye lens.

Symbol of aperture coefficient of f (f #) lens.

F/ refers to the relative aperture symbol of the lens.

Fl (feet) feet, engraved on the lens to indicate the shooting distance in English.

HID stands for high refractive index and high dispersion, which means that the lens is made of high refractive index and high dispersion glass. Dispersion and distortion can be minimized.

∞ (infinity) means infinity, which is the symbol of distance scale.

IF, the abbreviation of internal focusing, means that the lens adopts internal focusing structure, and the external lens barrel does not expand and contract during focusing, which is beneficial to the use of color filters.

IR Lens abbreviation Infra Red lens refers to infrared lens.

JC Ⅱ British and Japanese camera &; Short for Optical Instrument Inspestion, it is an inspection organization in Japan that specializes in inspecting cameras and optical products. Jintong label can be obtained through the tested lens.

Lock. Lock.

The abbreviation of LD English Low Dispersion refers to low dispersion.

M (manual) manual.

Macro macro, sometimes written as Micro.

The abbreviation of MC is Multiple Coating, which is engraved on the lens to indicate that the lens is coated with multilayer films.

The abbreviation of MF stands for Manual Focus.

M (meter) meter, engraved on the lens, represents the distance measured in metric system.

Open it, open it.

Close off, cut off, stop.

PC lens, the abbreviation of perspective control lens, refers to the displaced lens that can be perspective corrected.

PF is the abbreviation of Power Focus, which means power focus. This is a semi-automatic focusing mode between automatic and manual, powered by motor, and the focusing distance is controlled manually.

The infrared focus mark on the R (infrared) lens is sometimes indicated by a red ".".

SAF stands for single autofocus, that is, single autofocus. When this focusing mode is adopted, once the focus is focused, the distance will be stabilized, and the focusing distance will not be changed again because of the movement of the subject.

Short for SC English Spestra coating. The marks on the lens represent multilayer coatings.

Short for SD English. Refers to low dispersion.

SMC stands for super multilayer coating, which means super multilayer coating.

The abbreviation of SP English super Performance refers to low dispersion.

The abbreviation of soft lens refers to soft focus lens.

The shift lens refers to the perspective control lens.

SHM refers to high-quality lenses made of super-strong composite materials, which are usually lighter than ordinary lenses.