What is a SLR camera? Is it a professional or an amateur?

Single lens reflex (SLR) is the most popular viewfinder system, which is used by most 35mm cameras. 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. Therefore, you can accurately see the same image that the film is about to "see".

DSLR digital camera refers to a single-lens reflex digital camera, that is, digital, single-lens, lens and reflex. Representative models in the market are common in Nikon, 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.

When shooting in DSLR, press the shutter button, the reflector will pop up and the shutter curtain in front of the photosensitive element (CCD or CMOS) will open at the same time. The light that passes through the lens Nikon D90 will be projected on the original photographic plate, and then the rear reflector will be restored immediately, and the image can be seen again 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 viewfinder is always consistent with the image on the film, and its framing range is basically consistent with the actual shooting range, which is very conducive to intuitive framing and composition.

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.

The core of the SLR system is a movable mirror, which is placed in front of the film plane at an angle of 45. The light entering the lens is reflected upward by the mirror to a piece of ground glass. In order to correct this defect, the current eye-level SLR cameras are equipped with a pentaprism above the frosted glass. This prism reflects light many times to change the light path and send the image to the eyepiece. At this time, the ground image is upright up and down, and corrected left and right. When framing, most of the light entering the camera is reflected upward by the reflector to the pentaprism. Shutters of SLR cameras are almost always directly in front of the film (because they are located in the film plane, they are called focal plane shutters). When framing, the shutter is closed and no light reaches the film. Press the shutter button, the reflector quickly turns up to get out of the way, at the same time, the shutter opens, the light reaches the film, and the shooting is completed. Then, the mirrors in most cameras will be reset immediately.

This necessary tilting of the mirror also brings some other problems:

First, the viewfinder will be blocked at the moment of taking pictures. Because the shielding time is only a moment, this is not a big problem for the image that is reset immediately. However, it also raises some emergency issues. For example, when using stroboscopic shooting, you will not be able to see whether the stroboscopic device flashes normally through the viewfinder.

Second, the noise of the mirror moving. This may become an important problem where silence is needed. Because there is no moving mirror that suddenly blocks the light path in the ranging camera, this noise will not be generated.

Third, the vibration of the camera, that is, the overall movement of the camera caused by the tilting action of the mirror. Suppose you shoot at a shutter speed of 1/500 seconds, don't worry. This vibration will not be detected. However, if you take accurate photos at a low shutter speed, such as with a telephoto lens in low light, this vibration may cause great problems in imaging.

In addition, there is another problem with SLR framing. For example, if we want to shoot with a small aperture like f/32, the light allowed into the lens by f/32 is very weak, which will cause the image seen in the viewfinder to be blurred, and it may be difficult to focus or even impossible to focus at all.

In fact, the solution of SLR is quite clever. It will first use the maximum aperture of the lens to complete the framing and focusing. When the shutter is pressed, the aperture of the lens will immediately shrink to the preset aperture to complete the film exposure. At the moment when the exposure is completed, the aperture will be opened to the maximum aperture to prepare for the next shooting. [Edit this paragraph] Working principle SLR digital camera refers to a single-lens reflex digital camera, that is, DSLR (digital single lens reflex reflex).

In this system, after the light reaches the mirror through the lens, it is refracted 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.

When shooting in DSLR, press the shutter button, the reflector will pop up, and the shutter curtain in front of the photosensitive element (CCD or CMOS) will be opened at the same time, and the light passing through the lens will be projected onto the photosensitive original, and then the rear reflector will be restored immediately, 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 viewfinder is always consistent with the image on the film, and its framing range is basically consistent with the actual shooting range, which is very conducive to intuitive framing and composition.

In addition, 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, the positioning of SLR digital cameras in digital cameras is now a high-end product, so the area of SLR digital cameras is much larger than that of ordinary digital cameras in terms of the area of photosensitive elements (CCD or CMOS) related to the photographic quality of 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. [Edit this paragraph] The applicable object can simply say that the SLR digital camera is not suitable for any user. First of all, it is one thing to have the necessary professional knowledge. Secondly, to make good use of SLR digital cameras, we must 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.

Photography enthusiasts, professional photographers, sports photographers, journalists, news records, business records, new SLR players who enjoy the fun of manual operation, photography enthusiasts, etc. Are big fans of SLR digital cameras. [Edit this paragraph] Five advantages of SLR digital camera 1 and advantages of image sensor.

For digital cameras, the photosensitive element is one of the most important core components, and its size is directly related to the shooting effect. In order to achieve good shooting effect, the most effective method is not only to increase the number of pixels, but also to increase the size of CCD or CMOS. Whether using CCD or CMOS, the sensor size of digital SLR cameras is much larger than that of ordinary digital cameras. Therefore, the number of sensor pixels of digital SLR is relatively large (currently the lowest is 6 million), and the area of a single pixel is four or five times that of a civil digital camera, so it has excellent signal-to-noise ratio and can record a wide brightness range. The image quality of a 6-megapixel digital SLR camera definitely exceeds that of an 8-megapixel 2/3-inch CCD camera.

2. Rich lens selection

Digital camera is a product of optical, mechanical and electrical integration, and the performance of optical imaging system is also very important to the final imaging effect. Having an excellent lens is as important for imaging as the choice of image sensor. At the same time, with the cost reduction of image sensor, image engine and storage equipment, the proportion of optical lens in the cost of digital camera is also increasing. All brands have huge autofocus lens groups, from super wide angle to super telephoto, from macro to soft focus, users can choose matching lenses according to their own needs. At the same time, due to the large sensor area, it is easier for digital SLR cameras to obtain excellent imaging.

SLR digital camera lens 3, fast response.

The start-up speed of digital SLR is only a few hundred milliseconds, and continuous shooting is also very fast. Consumer cameras, on the other hand, are pure electronic shutters, which has a serious shutter lag problem. This weakness can be called the weakness of consumer digital cameras, so you can shoot still life, but it is not suitable for capturing moving objects-the image you get is often not the action when you press the shutter. Response speed is the advantage of digital SLR. Because their focusing system is independent of imaging equipment, they can basically achieve the same response speed as traditional SLR, which makes users handy in news and sports photography.

4. Excellent manual control ability

Although the camera's automatic shooting function is getting stronger and stronger today, a user who has certain requirements for photography will not be satisfied with shooting only in automatic mode because of the ever-changing environment and shooting objects. Digital SLR can easily manually zoom, manually set shooting parameters and so on, and can also take some special shots. But many consumer cameras are automatic (especially card machines). Most cameras have no manual zoom ring, so they can only zoom automatically by motor. Because the speed of zooming is slow, many shooting opportunities will be lost. Many people think that automation is better than manual operation, which is really a misunderstanding. Cameras with automatic function but no manual function are often low-end cameras, because the accuracy and speed of automation are far less than that of manual operation.

5, rich accessories

An important difference between digital SLR and ordinary digital camera is its strong expansibility. In addition to continuing to use additional lenses such as polarizers and interchangeable lenses, you can also use auxiliary equipment such as professional flashlights to enhance your ability to adapt to various environments. For example, high-power flash, ring macro flash, battery handle, timing remote controller, these rich accessories make digital SLR adapt to various unique needs, while ordinary digital cameras are greatly inferior.