What is a SLR digital camera?

SLR cameras have been significantly improved in both appearance design and functional configuration, and are increasingly favored by photographers. So what is a SLR digital camera? Let me tell you, welcome to read.

What is a SLR digital camera?

Digital SLR camera, referred to as SLR digital camera, is a kind of digital recording camera. 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.

The core of the SLR digital camera framing 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. Early SLR cameras had to hold the camera waist-high 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 head-up SLR camera installed a pentaprism above the ground glass.

The pentaprism reflects the light several times to change the light path and sends its image to the eyepiece. At this point, the 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, and the shutter of the SLR camera is almost in front of the film. 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.

Characteristics of SLR digital camera

A major feature of SLR 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 cameras in digital cameras is now a high-end product, so in terms of the area of photosensitive elements (CCD or CMOS) related to the photographic quality of digital cameras, the area of SLR cameras is much larger than that of ordinary digital cameras.

The difference in area between SLR digital cameras and ordinary digital cameras makes the photosensitive area of each pixel of SLR cameras much larger than that of ordinary digital cameras, so each pixel can show more detailed brightness and color range, which also makes the photographic quality of SLR digital cameras significantly higher than that of ordinary digital cameras, which is the main reason why most users prefer SLR digital cameras now.

SLR digital camera recommendation

1, Nikon D90

Nikon D90 is a leader among mid-range SLR cameras, and it is very popular as the world's first digital SLR supporting high-definition video shooting. Equipped with12.3 million effective pixel CMOS sensor, 3.0-inch TFT display screen, EXPEED image processing system and 720P high-definition dynamic video camera function, it better meets the photographer's demand for image quality and short film shooting function, and is one of the most popular mid-range SLR.

Nikon D90 adopts EXPEED image processing system, has 1 1 point focusing system, has continuous shooting function of 4.5 frames/second and fast response of 0. 15 second. Besides shooting still pictures, D90 also supports shooting video files in three different formats, namely 320×2 16 pixels, 640×424 pixels and 1280×720 pixels. The shooting time is 20 minutes, 20 minutes and 5 minutes respectively.

2. Canon 60D

Canon 60D adopts18 megapixel APS-C sensor, built-in Canon DIGIC4 image processor, and can take photos with the highest resolution of 5 184×3456. It adopts 9-point AF cross focusing system with ISO range of 100-6400, which can be extended to ISO12400 at the maximum. The camera has 6.5438+0.04 million pixels, and the display ratio is the same as the photo taken, which is 3: 2.

Canon 60D( 17-85mm) is also equipped with in-camera RAW image processing function, which can be used to convert RAW images into JPEG images. You can adjust brightness, white balance and photo style without using a computer. Therefore, when shooting, the photographer can focus on confirming the focus and composition, and can make various adjustments to the image on the spot without relying on the computer after shooting.

3. Pentax K-30

The biggest feature of Pentax K-30( 18-55mm) is its unique waterproof property, and the exterior of the fuselage looks very tough and fashionable. For friends who like outdoor mountaineering, the bulkiness of SLR cameras will affect their physical strength. Pentax K30 can help you cope with all kinds of shooting challenges.

Pentax K-30( 18-55mm) is equipped with APS-C CMOS sensor,16.3 million pixels. The ISO range is 100- 12800, which can be extended to 25600 at most, providing the anti-shake function of SR fuselage. 1 1 point autofocus system, the viewfinder visual range is 100%, and the framing magnification is 0.92, which is rare in the same level products. In addition, the framing range of 100% is not achieved by many mid-range products.