Excuse me, what is the use of P, S, M and A files on SLR cameras?

1, P-file automatic exposure mode: Generally speaking, choosing P-file program automatic exposure mode is a simple, fast and reliable way. When shooting indoors in low light, the built-in flash of the camera will automatically jump up and stand by. If you want to shoot in pure natural light, you can turn off the flash, and it will automatically combine into "big aperture and fast speed" as much as possible to prevent the image from blurring at slow speed.

When shooting in outdoor strong light, it will combine a smaller aperture with a higher shutter speed. At this time, you can turn on the built-in flash of the camera and use it as an auxiliary light for people when shooting in backlight. Some cameras also have an automatic exposure mode of "small aperture, low speed" in the P-file program.

2.A-stop aperture priority mode: A-stop aperture priority mode is also a depth-of-field priority automatic exposure combination. In photography, this method is adopted by most photographers. Because when selecting files, you can control the depth of field by adjusting the aperture size to show the relationship between virtual and real works. For example, taking landscape photos, using a smaller aperture (above F 1 1 or above F 16) can make all the scenes in the picture very clear and the image quality of the picture is also very high.

If it is necessary to highlight the subject and blur the background when shooting close-ups of portraits or other scenes, you can set a larger aperture to shoot. As for the exposure control, there is no need to worry, because in the process of adjusting the aperture, it will automatically track and set the corresponding shutter speed with the change of the aperture size to ensure accurate exposure.

3.S-speed priority mode: S-speed priority mode is generally used when shooting moving or high-speed moving objects, which requires a high-speed shutter to capture clear motion moments without a large depth of field. For example, when shooting track and field, ball games and other sports, the shutter speed should be at least 1/250 seconds or 1/500 seconds or even faster to ensure the clarity of the instantaneous image.

4.M-range manual control mode: M-range manual control mode is to manually adjust the shutter speed and aperture size, which is a bit complicated, less convenient than P, A and S modes, and not easy to capture, so it is rarely used at present.

You only need to use the flash as the auxiliary light to shoot the backlit portrait in natural light, and the natural environment requires accurate exposure; Or shooting portraits under night light requires both proper exposure of the face and correct exposure of the night background. This requires taking into account the flash index and the distance between people, taking into account the aperture size and the appropriate shutter speed to achieve the best of both worlds.

SLR cameras (SLR cameras) are also called SLR cameras. Refers to a camera that uses a single lens, through which light shines on the reflector and takes a view through reflection.

The so-called "single lens" means that the photographic exposure light path and the framing light path * * * use one lens, unlike the paraxial camera or the double-reflex camera, the framing light path has an independent lens. "Reflection" means that a plane mirror in the camera separates the two light paths: when taking a view, the mirror falls, reflecting the light of the lens to the pentaprism and then to the viewing window; When shooting, lift the reflector quickly, and the light can shine on the film or photosensitive element CMOS or CCD.

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Not all DSLR are high-end products.

2006 was the year when the DSLR war broke out in an all-round way. In this year, Sony, Samsung and Panasonic entered the DSLR market collectively, while traditional manufacturers such as Olympus, Nikon and Pentax also came up with their latest low-priced products to deal with it, which intensified product competition on the one hand and greatly enriched consumers' choices on the other hand, further reducing the price of entry-level DSLR to freezing point.

Although there are tens of thousands of high-end DSLR products, entry-level DSLR packages with lenses below 6000 yuan and single bodies below 5000 yuan abound, and this price is no longer a high-end product.

This price has almost reached the defense line of high-end consumer digital cameras. It can be said that the price difference between DSLR and high-end consumer cameras is not obvious, which will directly shake the choice of some consumers who originally planned to buy consumer cameras. Although DSLR is slightly larger than high-end consumer cameras, the control and imaging quality of DSLR have made a qualitative leap.

In addition, different lenses can be replaced as needed, which constitutes the absolute temptation of DSLR single-lens reflex camera. Consumer-grade cameras with the most choices of 2000 ~ 3000 yuan, although the imaging quality is also remarkable, are not comparable to DSLR at all.