Ask for five photography terms and explain them briefly ~ ~ Thank you ~ ~ Happy holidays!

Focal length refers to the distance between the focal point of parallel light passing through the lens and the lens. When the focal length of the lens is approximately equal to the diagonal length of the imaging plane, it is regarded as the standard lens of the machine. The standard lens focal length of ordinary 135 film is 50mm, 16mm in 2/3 inch CCD camera, 12mm in12 inch CCD camera and 8 mm in13 inch CCD camera. ..

2. What is an aperture?

A: The aperture is a set of metal plates arranged in the lens, designed as an adjustable circular aperture. The aperture can be changed by rotating the adjusting ring on the lens. Aperture size is indicated by f plus sign, such as f4, f5.6, f8, f 16, f22, etc. The smaller the number, the greater the light transmittance. The larger the number, the smaller the light transmission.

3. What is scaling?

Zoom is used to enlarge and reduce the subject. Zooming is achieved by using a zoom lens. When the image is clear, the size and angle of view of the image can be changed by changing the focal length of the lens.

4. What is the depth of field?

A: The depth of field refers to the clear range in the longitudinal direction of the shot image. For example, if you take a landscape photo, if the foreground, background and subject are clear, it means that the depth of field is wide; If the subject is clear and the background is unclear, the depth of field is small.

5. What is "white balance"?

A: This should first explain what is white. The color of light reflected by an object depends on the color of the light source. The human brain can detect and is more like this color change. Therefore, no matter in the sunshine, cloudy days, indoor burning light or fluorescence, people see the same white objects. But as far as digital cameras are concerned, the "white" produced by different light sources is still different in color, some contain light blue, and some contain yellow or red. In order to get close to human vision, digital cameras must imitate human brains and adjust colors according to light, so as to present the white seen by naked eyes in the final photos. This is called "white balance".