What's the name of a camera that you see and then shoot with your eyes?

SLR has two meanings. Optically, SLR refers to Single Lens Reflex, that is, single lens reflex, and single lens reflex digital camera, that is, digital digital, single lens, lens and reflex. It can make the images seen in the observation window always consistent with those on the film, and its framing range is basically consistent with the actual shooting range, eliminating the parallax phenomenon of the paraxial head-up framing camera. In sports, it refers to one of tennis backhand techniques. Tennis backhand techniques include one-handed backhand (referred to as "SLR") and two-handed backhand (referred to as "double backhand"). The SLR is elegant and stable. Directory [hidden] SLR camera profile profile does not exist parallax excellent lens advantages and common brand applicability advantages and disadvantages SLR camera 9 brand ranking SLR development record one of tennis backhand technologies SLR camera profile does not exist parallax excellent lens advantages and common brand applicability advantages and disadvantages SLR camera 9 brand ranking SLR development record one of tennis backhand technologies

[Edit this paragraph] Introduction to SLR camera SLR refers to single-lens reflection, which is the most popular framing system today. In this system, the unique design of the mirror and prism enables the photographer to directly observe the image passing through the lens from the viewfinder. It can be seen from the structural diagram of a single-lens reflex camera that the light passes through the lens and reaches the reflector, and then refracts to the focusing screen above to form an image. Through the eyepiece and pentaprism, we 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 of the film will be opened at the same time. The light (image) passing through the lens will be projected on the film to make the film sensitive, and then the reflector will immediately return to its original state, and the image can be seen in the viewfinder. This structure of the single-lens reflex camera ensures that it is shot through the lens, so that the image seen in the observation window is always consistent with the image on the film, and its framing range is basically consistent with the actual shooting range, eliminating the parallax phenomenon of the paraxial head-up framing camera. From the perspective of learning photography, it is very conducive to intuitive framing and composition. There is no parallax. Because the whole imaging system (focusing and shooting) is a lens, there is no parallax, that is, framing and imaging are consistent. (Traditional cameras are mostly paraxial cameras. Secondly, because the imaging system is used as the lens, the coordinated response is faster than that of ordinary cameras, so the SLR camera can better shoot high-speed moving objects (it will not miss the beautiful scenery because of the slow response of the camera). Thirdly, SLR cameras use lens transformation to form different photography systems. For example, you can change wide-angle lenses, lengthen lenses, add color films and choose macro lenses to meet your different needs. You won't miss the beautiful scenery because the camera lens is limited. Finally, because SLR cameras mostly use pure natural crystal or fluorite polished lenses, the price of excellent lenses is much more expensive than ordinary glass and plastic lenses. Some even use ultrasonic motors to adjust the lens, the vibration IS smaller than mechanical ones, and some have their own anti-shake patents (for example, Canon's EF series lenses have IS logo), especially the so-called pure natural fluorite lenses with red lines. A lens is between 30,000 and 50,000 yuan. Advantages and common brands of DSLR digital cameras refer to single-lens reflex digital cameras, that is, digital digital cameras, cameras, lens lenses and CMOS sensors. Representative models in the market are common in Nikon, Sony, Canon, Pentax, Fuji and so on. This kind of camera is usually big and heavy. Models that use electronic viewfinder EVF are also classified as SLR, but generally "similar" is added or EVF framing is indicated, such as Olympus C-2 100UZ and Fuji Finepix 6900. In the working system of SLR digital camera, after the light reaches the reflector through the lens, it refracts to the focusing screen above to form an image. Through the eyepiece and pentaprism, we can see the scenery outside in the observation window. In contrast, ordinary digital cameras can only see the captured images through the LCD screen or electronic viewfinder (EVF). Obviously, the directly seen image is more conducive to shooting than the processed image. A major feature of SLR digital cameras is that they can change lenses of different specifications, which is an inherent advantage of SLR cameras and incomparable to ordinary digital cameras. In addition, SLR digital cameras are now positioned as high-end products of digital cameras, so the area of photosensitive elements (CCD or CMOS) related to the photographic quality of digital cameras is much larger than that of ordinary digital cameras, which makes the photosensitive area of each pixel of SLR digital cameras much larger than that of ordinary digital cameras, so each pixel can show more detailed brightness and color range, which makes the photographic quality of SLR digital cameras significantly higher than that of ordinary digital cameras. Applicability It can be simply said that SLR digital cameras are not suitable for any users. First of all, we should have the necessary professional knowledge. Secondly, to make good use of SLR digital cameras, it is necessary to match different types of lenses, which is likely to make the cost of lenses higher than the cost of buying digital cameras. Moreover, when traveling abroad, the weight of camera bag with lens group is much higher than that of ordinary camera, which will become a serious burden in the travel process. In addition, when changing the lens of SLR digital camera, the photosensitive element will be directly exposed to the air, so we must also pay attention to the maintenance of the camera when using it. Therefore, although the shooting quality of SLR digital cameras is higher and the price has dropped a lot now, it is not suitable for all users, and users should choose according to their own needs when purchasing. [Edit this paragraph] Advantages and disadvantages Advantages Before the popularity of digital cameras using coaxial direct CCD, the advantage of single-mirror reflective cameras was that differences could be ignored. Accurate framing and focusing are particularly important for macro and long-distance photography. Some high-order DSLR can preview the depth of field. Most SLR cameras can change lenses freely. Common SLR lenses provide a wider aperture range than fixed-focus cameras, especially increasing the maximum aperture (for example, the maximum aperture of f 1.4 or even f 1.0 can be seen on a 50 mm fixed-focus lens). This brings two main benefits: you can take pictures in dark conditions without using a flash. A shallower depth of field can be obtained. Disadvantages Because of its complex mechanical device, the volume of SLR camera is larger than that of paraxial camera under the same frame. Because the mirror needs time to move, it will produce a relatively long shutter lag. In a SLR camera using an electronic system, the time delay problem may be prolonged due to the autofocus time. Because the mirror moves back and forth, it will cause extra noise and vibration. Some single-mirror reflex cameras have the function of pre-lifting the mirror, which is lifted and locked before taking pictures to reduce the vibration during exposure. However, this only applies to the case that the object will remain relatively still when the mirror is pre-lifted, because the observation window is dark at this time. In the case of small aperture, the viewfinder is very dark and it is difficult to focus manually. This problem has been slightly improved after the popularization of autofocus lens. In the case of using electronic flash equipment, the exposure time is limited. It is more difficult to design a wide-angle lens because it needs to leave room for the mirror to move. [Edit this paragraph] Top 9 brands of SLR cameras 1: Canon's dominance for SLR cameras is understandable. At the annual new product launch conference, there are always some innovations that make fans feel nervous. When buying a SLR camera, Canon should consider the recommendation index: ★★★★★ 2: Nikon's development period is a little later than Canon's. In fact, the contest between the two is far from the same. After all, the two are developing in different directions. For many enthusiasts, these two cameras are often compared. In fact, there are many misunderstandings. This is also a mistake made by many SLR beginners when they first started. For buying mid-range SLR cameras, Nikon is a good choice. Recommendation index: ★★★★★★ 3: Oba Oba pays little attention to Oba SLR cameras. Inadvertently told a few friends that Oba's SLR camera feels good. It has been used for a while, and the feel and quality are very good, which is also the reason why Oba can rank third. Oba produces few SLR cameras by itself. There won't be more than 10 kinds of SLR in total, but all kinds of SLR cameras have their unparalleled characteristics, which deserve your attention. In addition, the artistic taste of Oba itself is also perfect for the fuselage design, and the self-developed Live MOS photosensitive element is also worth tasting. Perhaps in the coming year, SLR will not be the world of Canon and Nikon, but will be the world of three points. Perhaps there is Obama's body recommendation index: ★★★★★★ 4: Sony's SLR camera. I really don't know how to say it or understand it. I always hear that Sony has new functions, but it is difficult to see the actual effect. The noise reduction function promulgated some time ago can bring many benefits to shooting, but for a SLR camera, shooting seems a bit extravagant, and buying a Sony SLR camera is also a very troublesome thing. When it was first listed, in many cases, SLR cameras could only be purchased by phone, or the purchase was restricted. In addition to the fun of buying, there are still many underexpenditures. And the number of Sony lenses is really small. If you want to get it all at once, besides the price, it is also very difficult to buy it, because Sony's SLR lenses can only be matched with Minolta and Zeiss, and the price of Zeiss on these two models is not common. Recommended index: ★★★★★★ 5: Pentax Pentax If you are a photographer who has just entered the ranks of photography hobbies, you can consider buying a SLR camera. Pentax will not release many overlapping SLR cameras, and each one is very fashionable and generous. The self-developed imaging engine provides higher data processing speed, can generate high-quality photos with more accurate colors and richer layers, and also supports high-speed video data processing. This is Pentax's most worthy consideration, and it is a good choice in the case of low budget. Recommended index: ★★★★★ 6: Leica recommended SLR: D-LUK4 recommended index: ★★★★★★ 7: Ricoh recommended SLR: GXR recommended index: ★★★★★ 8: Panasonic recommended SLR: GH 1 recommended index: ★ ★ ★ ★ ★ 9: Samsung recommended SLR: GX-20. SLR development record 1935, the Soviet Union made the world's first 135 SLR camera (спорт, in which спорт means British sports). 1936, Germany made the first 135 SLR camera Jhagee Exakta. 1949, Germany made the first pentaprism single-mirror reflex camera Contax s. 1950, and Germany made the first interchangeable window single-mirror reflex camera Exakta VX. 1954, Pentax Corporation of Japan published the world's first reflective camera Asahi Flex II, and Germany made the first reflective camera CONTAFLEX with a built-in metering mirror. 1960, Japan made the first high-speed KONICA F (metal shutter SLR camera), with the highest speed of 1/2000. 1960, Japan made the first high-speed Canon R2000 (Canon R2000), with a horizontal focal plane shutter, the highest speed 1/2000). 1960, Japan made the first single-mirror reflective camera pentax Spotmatic, and it was successfully commercialized in 1964). 1966, Minolta Company of Japan published the world's first SLR camera SRT- 10 1, which uses full aperture TTL to measure light. 197 1 year, Pentax Japan published the world's first full aperture automatic exposure SLR camera ES. 197 1 year, Canon of Japan published the world's first full aperture shutter automatic exposure SLR camera FTb. 1972, Canon of Japan announced the F- 1 motor, and the continuous shooting speed of nine frames per second was the fastest SLR camera with movable reflector at that time. 1977, Minolta of Japan introduced XD (or XD-7/XD- 1 1), which is the world's first SLR camera with multiple automatic exposure modes. 198 1 year, Pentax Japan released the world's first autofocus single-mirror reflex camera ME-f 1987, and Pentax Japan released the world's first autofocus single-mirror reflex camera SFX with built-in electronic flash. 1992, Canon of Japan released EOS5, which is the world's first single-mirror reflex camera with pupil control technology.