It is best to use the camera completely, and there are new words such as wide angle and focus. Better have a noun explanation!

Specifically, the lens can be divided into zoom and fixed focus.

We just tried a zoom lens, which is a zoom lens, that is, a lens that can be pushed and pulled. In addition, there are fixed-focus lenses, that is, you can't change the focal length by only one focal segment or only one viewing angle.

The appearance of the two lenses is obviously different. A fixed-focus lens has only one focus ring (which controls the definition, which will be introduced later), while a zoom lens has two rings, a focus ring (which controls the definition) and a zoom ring (which controls the viewing angle, that is, push and pull).

Fixed-focus lenses are easy to classify because their focal lengths are fixed:

Wide-angle lens: Generally, the lens below 35mm is a wide-angle lens, and the lens below 28mm is an ultra-wide-angle lens. Wide-angle lens has a wide angle of view, a strong sense of depth, and the scenery will be deformed, which is more suitable for shooting larger scenes, such as buildings and gatherings.

Medium focus lens: Generally, lenses from 36mm to 134mm are medium focus lenses. The medium focus lens is close to people's normal perspective and perspective, and the scene has little deformation, so it is suitable for taking portraits, landscapes, tourist commemorative photos and so on.

Telephoto lens: Generally, lenses higher than 135mm are telephoto lenses, also called telephoto lenses. Among them, the lens larger than 300mm is a super telephoto lens. The telephoto lens has small viewing angle, weak perspective and small scene deformation. Suitable for shooting things that are inaccessible, such as wild animals and stages. It can also be used to blur the background and shoot portraits.

The zoom lens is difficult to be generalized because of the change of focal length. Assuming that its focal length changes between one or two segments of wide-angle, medium-focus and telephoto, it can also be called wide-angle zoom lens, medium-long zoom lens and so on.

See (published by Electronic Industry Press)

Original capture

Professional cameras are also called SLR cameras, and complete cameras should be called SLR cameras. The unique design of the mirror and prism of this camera enables the photographer to directly observe the image passing through the lens from the viewfinder. After the light reaches the reflector through the lens of the camera, it is refracted to the focusing screen above to form an image. Through the eyepiece and pentaprism, the photographer can see the scenery outside in the observation window. When shooting, press the shutter button, the reflector will pop up and the shutter curtain in front will open at the same time. The light (image) passing through the lens will be projected to the photosensitive part (traditional camera is film, digital camera is CCD or CMOS) to make it photosensitive, and then the reflector will immediately return to its original state, and the image can be seen in the observation window. The lens of a professional camera can be completely removed and replaced with another lens, thus obtaining different shooting effects. Professional cameras have a wide range of lenses, with prices ranging from thousands to tens of thousands, and many lenses are even more expensive than the fuselage. All kinds of functions and indexes of the fuselage must rely on excellent optical lenses to complete. Through the image conversion of the lens group in the lens, the best effect of the current lens is achieved. How to choose a variety of camera lenses? It depends on the kind and route of shooting you are good at, to judge what lens you should buy most. Don't buy blindly, resulting in repeated focal lengths.

Quasi-professional camera

The lens of a quasi-professional camera cannot be replaced, but it can be replaced by adding other lenses or lenses. Although its shooting effect is slightly inferior to that of professional cameras, its price is its advantage. Because the price of a quasi-professional camera plus a relatively complete set of additional lenses and lenses is roughly 10000 yuan, which is basically equivalent to the price of an entry-level professional SLR camera body. Therefore, quasi-professional cameras are most suitable for individual high-end users with certain photographic skills.

Ordinary camera

Ordinary cameras refer to those lenses that can't be replaced, and other lenses or lenses can't fit. Most of the operations are automation products, which are commonly known as "fool cameras" in our daily life.

We can draw the conclusion that the lens refers to the part of the camera that receives optical objects and adjusts them to realize optical imaging (other optical instruments, such as digital cameras and microscopes, also have lenses with similar functions). At present, the lenses of cameras can be divided into two categories. One is the standard lens that comes with the camera. Generally speaking, cameras have their own standard lenses. The other is a lens that enhances and expands the original standard lens function of the camera. We can call it a functional additional lens. For example, telephoto lens increases the shooting distance of the camera, and wide-angle lens increases the viewing angle. The lens mentioned here mainly refers to the latter.

Canon high-end EF lens technical terms

Image stabilizer

In real life, carrying a tripod is a very troublesome thing. For example, when hiking, traveling or using a tripod are not allowed, it is difficult to avoid image blur when shooting in low illumination, no matter how stable the hand-held camera is. Canon has a way to solve this problem. A kind of SLR mirror with built-in image stabilizer has been developed successfully. According to the vibration angle and times of the lens, the rotating unit and the moving optical system of the optical compensation system will perform compensation motion to correct the vibration.

Ultrasonic motor

The ultrasonic motor (USM) in Canon EF lens is driven by ultrasonic vibration force, which is fast and quiet, making the autofocus operation of EF lens fast, accurate and almost silent. This kind of direct drive structure is very simple, which improves durability and work efficiency. Ultrasonic motors are divided into two types: ring and miniature. The former is mostly used for large aperture and super telephoto lenses; The latter is mostly used for economical lenses. Proper use will make the autofocus effect better.

Carl zeiss and Sony.

Carl zeiss from Germany, with advanced optical technology, will be an optical layman of Sony. With strong technical support, Sony has become a big name of consumer-grade DC. In recent years, Sony's SLR cameras have been constantly innovating and constantly correcting various problems. The SLR market has changed the situation that two companies dominate and three companies divide the world. Sony and carl zeiss used a variety of high-end optical SLR lenses together. Unfortunately, the lack of a rich lens product system has led to the situation that customers can afford the machine but can't afford the lens. However, domestic players are turning to manufacturers such as Longteng!

1.ZA series

ZA series lens, according to official website, is an autofocus SLR lens jointly produced by Sony and Zeiss. Lens The optical lens is provided by Zeiss, and the electronic system is designed by Sony. ZA series lens is the only autofocus Zeiss brand lens produced at present. According to the tests of websites such as photodo, the optical quality of ZA lens is excellent, which can meet the demanding requirements of high-pixel digital SLR cameras for resolution. Including:

Sony α carl zeiss distagont *1:2 24mm zassm [sal-24f2z]

Sony α carl zeiss plane t *1:1.4 85mm za [sal-85f14z]

Sony α carl zeiss Sonnar T *1:1.8135mm za [sal-135f18z].

Sony α carl zeiss vario-sonnart * dt1:3.5-1:4.516-80mmza [sal-1680z]

Sony α carl zeiss Vario-Sonnar T *1:2.8 24-70mm ZA SSM [SAL-2470Z]

Sony α carl zeiss vario-sonnart *1:2.816-35mm zassm [sal-1635z]

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