A series of digital camera terms

1, exposure compensation It is also an exposure control method, generally common in ± 2-3ev or so, if the ambient light is dark, you can increase the exposure value (such as adjusted to +1ev, +2ev) to highlight the clarity of the picture.

2. Exposure The exposure is the most primitive key factor in image composition. It is mainly determined by the aperture and the shutter.

3, hologram autofocus holographic autofocus function (hologram af), is a new AF optical system, using advanced laser holographic technology, the use of laser spot detection of the subject's edge, even in dark environments can also focus on accurate shooting Photos, effective shooting distance of 4.5 meters.

4, color depth color depth (depth of color), color depth, also known as color number, it is used to represent the digital camera's color resolving power. Digital cameras with n bits for each color in the red, green, and blue color channels have a total color number of 3n, and the total number of colors that can be resolved is 23n. For example, a 24-bit digital camera can obtain a total of 2 (24). Power), that is 16 777 216 colors. The more color digits a digital camera has, the more details it can capture. Usually a digital camera has 24 bits of color, and digital cameras for advertising photography and other special industries generally require 30 or 36 color depths.

5, flash flash is also one of the ways to enhance the exposure, especially in dim places, hit the flash to help make the scene more bright. However, when shooting people, the flash light may be left in the pupil of the eye, and then the phenomenon of “red-eye” occurs. Therefore, many camera manufacturers will add red-eye reduction to the design, so that the flash can be made to glow before the flash is turned on. Pupils adapt and then perform real flashes to avoid red eyes.

6, slow sync slow sync (slow) is a camera and flash with a high-level function. The slow synchronization of the flash means that in the early morning, late evening or a certain lighting night, the shutter speed is properly reduced, and at the same time using the flash, the exposure of the subject can be normal, and the background can be properly exposed to enrich the picture effect.

There are two modes for slow synchronization: pre-sync and post-sync. Pre-sync means that the flash fires immediately after the shutter is fully opened. It is suitable for general situations and it is convenient for capturing the timing of shooting, such as the character's demeanor. Post-sync refers to the flashing when the shutter is about to close. It is suitable for shooting moving bodies and can pull out the moving track of the moving body. , forming a strong dynamic effect.

7, flash index gn

The flash index, gn, is one of the indices that reflect the power of the flash. A good flash should have a stable and adjustable output, a color temperature standard (generally about 5500k, the same as daylight), fast return speed, steerable, and changeable lighting range. For film or digital camera settings with iso 100 sensitivity, gn = aperture coefficient x shooting distance in meters.

8. The purple edge of the digital camera's purple edge digital camera is an indexing camera. In the shooting process, the phenomenon of the contrast between the highlight and the low-light parts is the phenomenon of the contrast of the subject. Or other colors). The reason for purple fringing is related to the dispersion of the camera lens, the small ccd imaging area (high density of the imaging unit), and the signal processing algorithms inside the camera.

9. Noise or Noise Noise or noise. Foreign pixels that should not appear in the image are usually generated by electronic interference. It looks like the image is dirty, covered with tiny, rough spots.

10, digital back digital back also known as digital back, is a ccd chip and digital processing and other parts, and no lens and other institutions, only attached to other traditional camera body can be used to shoot the device, is added to Medium-sized cameras and large-sized cameras are devices that allow digital cameras and large-scale cameras to take digital pictures.

11. The dual-mode index code camera itself has two modes of continuous motion photography with a single still camera and a video camera with a digital camera.

12. Pseudo-color pseudo-color refers to the color stripes and noise appearing in the dark part of the photo, which is caused by the weak image signal in the dark part, the reduced signal-to-noise ratio, and the display of the photoelectric interference signal. Since this is an interference signal that the actual image should not have, it is called Pseudo color.

13, the equivalent of 35mm camera The current digital camera imaging device area is smaller than the area of ​​the ordinary 135 film, so the focal length of the lens is very short, when it comes to the lens focal length often does not say its actual physical focal length, and that its perspective is quite 35mm (domestic 135) camera lens focal length, that is, its lens angle of view is equivalent to xx.