The advantages of the focus lens are mainly reflected in the use of short focus:
1, fixed focus wide-angle or standard lenses are generally larger than the zoom lens that covers the corresponding focal length. General fixed focus wide-angle lens aperture and focus in more than 2.8, the amount of light, easy shooting in low light conditions.
2, fixed focus wide-angle lens generally than the corresponding focal length zoom lens, the shortest focus distance. For example, the shortest focus distance of EF17-35 is 0.42m, while the shortest focus distance of EF20/2.8, EF24/1.4, EF28/1.8 and EF35/2 is 0.25m. The shortest focus distance is a lot of benefit, especially for wide-angle lenses, the near focus distance means that the camera can be very close to the main body to obtain a large image. And with their large aperture matching, can zoom wide-angle lens is not easy to achieve wide background virtual effect.
3, fixed focus wide-angle lenses are generally smaller than the corresponding focal length zoom lens, light weight. This can make your camera will not be so loud, easy to capture.
4, wide angle lens imaging is generally wide-angle zoom lens, which is decided by the design of the lens, zoom lens focal length due to the consideration of all have a relatively good image, we must sacrifice the interests of the local to the whole has a relatively good performance. But the focus lens doesn’t need to be considered.
Lens (prime) refers to a lens with only a fixed focal length, with only one focal segment, or only one field of view. Fixed focus lens without zoom function. The design of fixed focus lens zoom lens is relatively much simpler, but generally zoom in zoom process on the image will be affected, while the fixed focus lens with respect to the maximum benefits of the zoom machine is fast speed, stable image quality. Many digital cameras with fixed focus lenses take pictures of moving objects clearly and stably. The focus is very accurate, the picture is exquisite, the sense of grain is very slight, and the photometry is accurate.
Digital SLR camera than ordinary digital cameras are much more expensive, now the most low-end entry set of at least three thousand or four thousand yuan, generally seven thousand or eight thousand high-end models, hundreds of million or even several million.
2. bulky, inconvenient to carry
SLR in order to do easy manipulation, most of the functions are made of button on the body, so is unlikely to do ordinary imaging card machine size, the volume is relatively large, poor portability, generally buy SLR after all, need a special camera bag to pack, the bag is generally not too small, because there are a lot of accessories!
3., manipulation is more complicated
Most of the ordinary digital camera basically does not have any manual function, are all automatic shooting, shooting parameters are automatically set by the camera, you just select the king, one press the shutter becomes. And although there are automatic digital SLR camera shooting function, the general who do not, because it provides manual function is very powerful, photo of friends love manually set their own camera parameters, a pat according to set the aperture, shutter, ISO, white balance, metering etc. several parameters, not familiar with the manual function of friends it is difficult to use it to take good photos.
4. late investment
Ordinary digital cameras are a one-time investment, after buying the camera, basically do not have to spend any money. And for SLR digital cameras, after buying the body, that’s only a start, you still need to spend money to go with a variety of lenses – play SLR is playing lenses! A lens, Yiliangqianqian yuan cheap, expensive million, while playing SLR with only a few shots, began to burn are buying more and more.
Single lens reflex viewfinder camera (Single, Lens, Reflex, Camera, abbreviated as SLR camera) is also called SLR camera. It refers to a camera with a single lens, and light is reflected through the lens onto the reflector.
The “single lens” refers to photography, exposure, light path and viewfinder light sharing a lens, unlike the side axis camera or double reverse camera, viewfinder, light path has independent lens. The “reflection” refers to the camera in a plane mirror two separate optical viewfinder viewfinder: fall, the lens light into five prism, then to the viewfinder; when shooting the mirror fast lift, light can be irradiated to film or photosensitive element CMOS or CCD.
DC digital camera brand list, SLR brand, digital camera, what brand is good, digital camera recommended 
Started in 1937 in Japan, the well-known production of image and information products integrated group, photographers familiar with the SLR brand, the world’s top 500, Canon (China) Co., Ltd.
Started in 1917 in Japan, the world’s leading optical product design and manufacturer, specializing in the field of photography, Nikon imaging instrument sales (China) Co., Ltd.
Started in 1946, Japan, Japan’s representative enterprise, world electronics 3C/ game / financial / entertainment giant, portable digital products pioneer, Sony Corp
Founded in 1934, Japan, world renowned integrated imaging / information / document processing products and services manufacturing and suppliers, Fuji film (China) Investment Co., Ltd.
Began in 1907 in Germany, the world famous optical instrument manufacturers, exquisite production and expensive price is its brand logo, the ten major telescope brand, Leica camera Trading (Shanghai) Co., Ltd.
Founded in 1946, Japan is famous for its multi-functional G-SHOCK watches. It is a well-known manufacturer of electronic instruments / electronic consumer products. CASIO (China) Trading Co., Ltd.
In 1918, Japan, the world’s leading consumer electronics brand, involved in home appliances / digital audio / video / office products / aviation and many other fields, the world’s leading integrated electronic technology enterprise group
Founded in 1919, Japan, the world’s leading optical digital technology, the world leader in camera industry, the world’s more representative of precision optical technology enterprises, OLYMPUS (China) Co., Ltd.
In 1919 Japan, a subsidiary of Ricoh Co, the world famous brand SLR camera, a leading manufacturer of imaging equipment, Ricoh imaging equipment trading (Shanghai) Co. Ltd.
Founded in 1936 in Japan, the world famous office equipment and optical machine manufacturers, digital office equipment solutions for the well-known enterprises, Ricoh (China) Investment Company Limited
There are many wonderful memories of life. The camera can record the most beautiful pictures of life and leave it to the lake for a long time. A good camera can leave a good picture. Consumers in the choice, there will be a lot of doubt, what brand of camera is good? Which areas of the camera brand are distributed most? Where’s a better camera? What are some of the brand names such as big brand, famous brand, provincial brand and so on? In order to give the consumer camera market to provide real and accurate information industry brand, the following is CNPP to provide data support, camera ten brands list for your website statistics and relevant brand recommendation, for your reference.
Aperture: priority, mostly for shots, portraits, and scenery. Aperture priority is to manually define the size of the aperture, and the camera will determine the shutter speed based on this aperture. Since the aperture size directly affects the depth of field, this pattern is most widely used in normal shooting. When shooting a portrait, I usually use the long focus of the large optical circle to achieve the virtual background, so as to gain a deeper depth of field, so that the main body can be highlighted. At the same time, larger aperture can also achieve faster shutter value, thereby enhancing the stability of hand shot. When I take pictures of landscapes, I tend to use smaller apertures so that the depth of field is wide enough to make the distance and the near scene clear, as well as the night scene.
Shutter: priority for more moving objects, such as sports, moving vehicles, waterfalls, flying objects, fireworks, water droplets and so on. Contrary to aperture priority, the shutter priority is obtained by camera metering when the shutter is manually defined. Shutter priority is used mostly for shooting objects, especially in sports shooting. A lot of friends when shooting moving objects found that often shooting out of the main body is fuzzy, this is mostly because the shutter speed is not fast enough. In this case, you can use the shutter priority mode to determine a shutter value and then shoot. And the operation objects are generally regular, then the shutter value can also be estimated, such as shooting pedestrians, shutter speed is only 1/125 seconds to almost the same, while filming the whereabouts of the drop is needed 1/1000 seconds.
1, quality first – fixed focus must be better than zoom
If you ask a friend’s opinion, I believe almost everyone will tell you that the focus lens is better than the zoom lens. This statement is largely true, but it is not absolute. Just zoom itself several points, if the zoom lens kit and fixed lens than it is not fair.
Measure from the number of lenses
Focusing lenses are generally accepted as good quality, which may prove the principle of simplicity and beauty. Because of the zoom, the increase in lenses is understandable. But more lenses are also more easy to cause some problems, such as color, due to internal refraction increased the number of light scattering optical axis to the higher the chance, appear purple edge of the more prone to make high contrast. In addition, sharpness is constantly discounted due to multiple lenses. Therefore, to pursue quality, focus lens is the first choice.
Measure from lens quality
But too much lenses can affect picture quality, and it’s not absolutely true. The quality of lenses is also an important consideration in itself. Advanced zoom lenses use high quality lenses such as fluorite, ultra low dispersion lenses, and nano coating to improve transmittance and refraction. Even if the lenses are large in number, they can also keep the picture quality.
Contraction of the aperture after the performance
The aperture size also affects the lens performance. Usually the small aperture, sharpness will be improved, but also can reduce glare problems. General down two aperture, the best line number has been reached, the naked eye may not tell from fixed focus or zoom lens. In fact, the general standard zoom lens is not very bad, but because of cost considerations, the quality of the lens and the correction effort can not be compared with the lens, as far as possible contraction aperture to achieve better image quality, so often experienced users look down. Therefore, if the quality of the image to choose focus or zoom, it is better to choose advanced zoom or general zoom lens is worth discussing, after all, focus lens itself has provided a certain quality assurance.
2, aperture first – fixed focus contrast zoom absolute superiority
Take a test on you first. Can you find a zoom lens with an aperture greater than f/2? I’m sure you haven’t seen a CCTV yet or a card machine. For a while I saw OLYMPUS launched two f/2 aperture zoom lenses. Although it is not certain whether future technology will develop into such a large lens, the zoom lens can’t make a larger aperture, mainly the volume and weight limit.
Single lens reflex viewfinder mode basically means the professional positioning, which is certainly the way professional digital SLR camera, even for users and friends usually fever products also has a large number of attractions. The focal length and aperture are the two most important parameters in digital SLR (also called SLR digital camera) or DSLR lens parameter.
The first is a wide-angle lens. Traditionally, a wide angle lens refers to a lens with a focal length below 35mm, such as 28mm, 24mm, or even a 16mm lens. Generally speaking, lenses below 24mm are called ultra wide angle lenses. However, because the vast majority of digital SLR on the market is not a full range of digital SLR lenses, the focus of the lens should be multiplied by 1.5 or 1.6, so for such SLR, 16mm can be regarded as ultra wide-angle lens.
The second is the standard lens. In general, the focal length is 50mm or 85mm. 50mm’s lens view is closest to the human eye, so it is called the heading”. But because of this, want to make good use of the header is very difficult, because it is not like ultra wide angle or macro lens that can shoot the human eye to feel the picture. 85mm’s shots are usually portrait lenses.
The third is the telephoto lens, usually 100mm or 135mm. The 100mm lens is a macro lens, 135mm lens and portrait lens, just focus on the half length portrait, while 85mm is more focused on the body of the portrait.
The focal length above 200mm is what we call the telephoto lens. In fact, the focus section is wide enough to photograph landscapes, portraits, or eco photography (for example, shooting birds, etc.), especially 300mm and even more than 400mm. However, these lenses are usually big and heavy, and lack the help of anti shake. There are still many restrictions to use, so there is not much chance of using them.
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