How many wide angles is 120 degrees equivalent to?

The viewing angle 120 degrees belongs to the wide-angle friend lens. The actual visual range is 120 degrees. You can draw it yourself with a triangular ruler to see how big the angle of 120 degrees is. If the focal length is 120, it belongs to telephoto lens. On the phase machine, the standard lens is 50, and the value with a wide angle greater than 50 is considered as a telephoto lens. For example, 28 is a wide-angle 70. Even if the telephoto wide-angle lens is telephoto, the optical lens can be divided into small-field lens, ordinary lens (about 50 degrees), wide-angle lens and ultra-wide-angle lens (100- 120 degrees) according to the field of view.

1, standard lens: the viewing angle is about 50 degrees, which is also the viewing angle that a person can see with one eye without turning his head and eyes, so it is also called standard lens. The standard lens focal length of a 5mm camera is mostly 40mm, 50mm or 555 mm.. The standard lens focal length of 120 camera is usually 80mm or 75mm. The larger the CCD chip, the longer the focal length of the standard lens.

2. Wide-angle lens: The viewing angle is greater than 90 degrees, which is suitable for shooting scenes with close distance and large range, and can deliberately exaggerate the strong sense of distance in the foreground, that is, perspective. A typical wide-angle lens of a 35mm camera has a focal length of 28mm and a viewing angle of 72 degrees. The 50,40mm lens of 120 camera is equivalent to the 35,28mm lens of 35mm camera.

3. telephoto lens: suitable for shooting long-range. Small depth of field is easy to make the subject with blurred background stand out, but it is huge and difficult to focus on the dynamic subject. The long focal length lens of a 35mm camera is usually divided into three levels, with the medium focal length below 135mm and the long focal length below 135-500mm.

It's called ultra-long focal length. 150mm lens of 120 camera is equivalent to 105mm lens of 35mm camera. Because the lens with long focal length is too heavy, there is a design of telescope head, which is to add a negative lens behind the lens and move the main plane of the lens forward to get the lens body with short focal length.

4. Reflective telescope head: It is another design of super telescope head, which uses a mirror to image. However, due to design reasons, the aperture cannot be installed, so the exposure can only be adjusted by the shutter.

5. marco lens: In addition to very close macro photography, you can also take long shots. The problem itself is contradictory. Angle of view 120 degrees belongs to the dating lens. The actual visual range is 120 degrees. You can draw it yourself with a triangular ruler to see how big the angle of 120 degrees is. If the focal length is 120, it belongs to telephoto lens. On the phase machine, the standard lens is 50, and the value with a wide angle greater than 50 is considered as a telephoto lens. For example, 28 belongs to a wide angle of 70, even if it is