Why is it called SLR camera and its principle (summary of advantages and disadvantages of SLR)

Many friends buy cameras for the first time, and they must buy big ones. They look fashionable and professional, and choose digital SLR directly. But what exactly is a SLR? What is a digital SLR?

To understand digital SLR cameras, start with DSLR cameras.

SLR camera is a single-lens reflex camera, that is, the fuselage only uses one lens, and the fuselage is equipped with a mirror mirror 3354. The light from the camera lens is reflected by the reflector to the optical viewfinder on the upper part of the camera body, which is used to observe the scene and observe the composition.

Since19th century, SLR cameras have appeared in various shapes and forms with film as the recording medium.

The predecessor of SLR camera is used to make it convenient for painters to draw the scenery as it is.

Digital SLR is a SLR camera with electronic image sensor as the recording medium.

The feature of SLR camera is that it can complete framing, focusing and shooting through one lens.

When taking a view, the light reflected from the scene passes through the full aperture lens and is projected onto a reflector installed at an elevation angle of 45 degrees inside the fuselage, and is vertically reflected upwards and projected onto the focusing screen. Then, the image is reflected twice by five prisms, so that the original inverted image is corrected into a positive image and then enters the viewfinder for the photographer to observe the real scene.

When the shutter is pressed, the lens aperture shrinks to the working aperture. At the same time, turn the reflector upward to block the vertical light path and open the horizontal light path to let the light pass directly. The focal plane shutter also opens the front curtain at the same time, so that the light of the image is directly projected onto the image sensor to realize exposure.

During the exposure, the shutter remains open until the exposure is completed. When the shutter is closed, the lens aperture is restored to the maximum aperture, the reflector is restored to its original position, and the light is re-emitted to the viewfinder, so that the shot scene can be seen again.

Next, the camera will do a lot of complicated image processing:

The camera obtains digital information from the image sensor, converts it into an appropriate image format, and then writes it into the memory card.

The advantage of SLR cameras, silly cameras and mobile phones is that they usually use interchangeable lenses, which can be used to meet different shooting needs.

The internal space of SLR camera body is enough to accommodate a larger image sensor, which lays a good foundation for providing high-quality photos.

Similarly, the wide body can also provide more shortcut keys, which is convenient for quickly adjusting parameters during shooting to cope with the ever-changing shooting scenes.

SLR cameras use an optical viewfinder, so they don't need power support in the framing stage. It only uses electricity at the moment of shooting, so it consumes little electricity. Moreover, the capacity of SLR battery is relatively large, so it can get a long endurance and perform well in low temperature environment.

Only when the SLR camera is exposed, the image sensor will be powered on, which can effectively avoid the problem of excessive thermal noise caused by long-term work of the sensor and greatly improve the image quality.

SLR camera has an independent focusing system, which is fast and accurate, and has good focusing performance for shooting moving objects with continuous displacement changes.

Professional camera body, usually all-metal structure, is durable and can adapt to difficult shooting environment.

The Flash was armed to the teeth and shot at the Waterfall. Use Nikon D5.

Disadvantages of SLR cameras Because of its huge body and solid structure, SLR cameras are heavier and less portable than stupid cameras and mirrorless cameras.

When shooting, turning the reflector up and down will vibrate. When the shutter speed is slow, it will have a certain adverse effect on the image quality. Therefore, when the shutter speed is slow, it is recommended to use the reflector pre-lifting function 3354. Before exposure, lift the mirror and stabilize it before exposure.

SLR cameras use optical viewfinder, and photographers can directly observe the influence of exposure on the image and the final effect before shooting, so they need to rely on the photographer's rich experience to play back the photos after shooting and check whether the shooting effect is in line with expectations.

When shooting, because the reflector is folded, there is no reflected light on the focusing screen, and the optical viewfinder will be completely black, so the photographer can't see the shot image from the viewfinder.

Summary SLR cameras can provide excellent shooting performance and excellent image quality. It is an indispensable shooting equipment for professional photographers who need high-quality images or may need to shoot in a hard working environment.

Because the fuselage is huge and bulky, which affects the comfort of the strap for a long time, non-professionals should be mentally prepared.

1: Comments:

Image sensor is a large-scale integrated circuit composed of tens of millions or even hundreds of millions of pixel units, and each pixel unit can capture light and convert it into electrical signals. With the help of pixel array, the image sensor finally generates digital photos.

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