What does a camera SLR mean? Comprehensive analysis of SLR camera

With the improvement of the quality of life and people's nostalgia for the beautiful things in life, cameras are becoming more and more popular, and the introduction of SLR cameras has made photographers even more reluctant to put it down. So what does SLR mean? Today, let's take a look at the comprehensive analysis of SLR cameras with Xiaobian, so that you can know what the camera SLR means.

what does a camera SLR mean?

SLR means SLR(SingleLensReflex, which is the most popular viewfinder system. Most 35mm cameras use this viewfinder. In this system, the unique design of reflector 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". The heart of the system is a movable mirror (as shown in the light blue part), which is placed in front of the film plane at a 45 angle. The light entering the lens is reflected upward by the reflector to a piece of ground glass.

Early SLR cameras had to hold the camera waist-level and look down at the ground glass. Although the image on the ground glass is upright, it is upside down. In order to correct this defect, the current eye-level SLR camera is equipped with a pentaprism above the ground glass. This kind of prism reflects the light many times to change the light path, and sends the image to the eyepiece. At this time, the ground image is upright up and down and corrected left and right.

when taking a view, most of the light entering the camera is reflected upward by the reflector to the pentaprism. Almost all the shutters of SLR cameras are directly in front of the film (because this shutter is located in the film plane, it is called the focal plane shutter). When taking a view, the shutter is closed and no light reaches the film. When the shutter button is pressed, the reflector quickly turns up to get out of the way, and at the same time, the shutter is opened, so the light reaches the film and the shooting is completed. Then, the mirror in most cameras will be reset immediately.

What does a camera SLR mean? Technology

First, let's know what a digital SLR camera is. To put it bluntly, a digital SLR camera is a digital camera using the new technology of SLR. As a professional digital camera, the photos taken with it are incomparable to ordinary cameras in terms of clarity and photo quality. These are the high performance of digital SLR cameras made by SLR technology.

single lens reflex. A camera using this technology has only one lens, which is responsible for both photography and framing. In this way, the problem of poor photo quality caused by parallax can be basically solved. Moreover, when taking a view with a SLR camera, the light from the object is focused by the lens, reflected by the inclined reflector to the focusing screen for imaging, and then reflected by the "roof prism" ridged at the top. The photographer can observe the scene through the viewing eyepiece, and it is the same image as the scene, so it is very convenient to take a view and focus. When shooting, the mirror will bounce up immediately, the lens aperture will automatically shrink to a predetermined value, and the shutter will open to make the film sensitive; After the exposure, the shutter is closed and the mirror and lens aperture are reset at the same time. This is the SLR technology in cameras, and now digital cameras have become professional-grade digital SLR cameras after adopting this technology.

The single-lens reflective framing method basically means professional positioning, which also doomed the professional road of digital SLR cameras. Even products for ordinary users and enthusiasts have a lot of advantages.

What is the meaning of camera SLR? Working principle

DSLR, a Digital SLR camera, or digital SLR camera, refers to a Single-Lens Reflex digital camera, that is, the abbreviation DSLR for digital digital, single camera, lens lens and reflex reflex. Its photosensitive device is CCD or CMOS. This kind of camera is generally large and heavy.

In the working system of a SLR digital camera, after the light passes through the lens and reaches the reflector, it refracts to the focusing screen above and forms an image. Through the eyepiece and pentaprism, we can see the scenery outside in the viewing window. In contrast, general digital cameras can only see the captured images through LCD screen or electronic viewfinder (EVF). Obviously, the image directly seen is more conducive to shooting than the image seen through processing.

when shooting in DSLR, when the shutter button is pressed, the reflector will bounce 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 again in the viewing window. This structure of the single-lens reflex camera ensures that it is shot through the lens, which can make the image seen in the viewing window always the same as that on the film, and its framing range is basically the same as the actual shooting range, which is very conducive to intuitive framing and composition.

In the SLR system, the unique design of the reflector and prism enables the photographer to directly observe the image passing through the lens from the viewfinder. As can be seen from the structural drawing of the single-lens reflex camera, after the light passes through the lens and reaches the reflector, it refracts to the focusing screen above and forms an image. Through the eyepiece and pentaprism, we can see the scenery outside in the viewing window.

What does a camera SLR mean? Main features

A great feature of a SLR digital camera is that it can exchange lenses of different specifications, which is an inherent advantage of a SLR camera and is incomparable to ordinary digital cameras.

in addition, SLR digital cameras are now positioned as high-end products in digital cameras, 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 far 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.