What is a viewfinder?

The viewfinder is a part of a digital camera, which monitors the image through the eyepiece. Now the eyepiece viewfinder of digital camera has black-and-white viewfinder and color viewfinder.

But for professional digital cameras, they are all black and white viewfinders, because black and white viewfinders are more conducive to photographers to make correct compositions. The viewfinder structure of a digital camera is the same as its LCD screen, both of which use TFT LCD. The difference lies in size and power consumption.

What is separated from the lens is generally called an optical viewfinder. No matter whether the lens of the camera is fixed focus or zoom, the framing of the optical viewfinder is unchanged. When working, it has nothing to do with the lens, but imitates the perspective and focal length of the lens.

What passes through the lens is generally called TTL viewfinder (mostly used in SLR cameras). This kind of viewfinder is usually equipped on expensive digital cameras, which can display the images taken by the lens.

Extended data

The viewfinder has two main indicators: viewfinder magnification (viewfinder magnification for short) and viewfinder range.

The magnification of framing is large, the viewing angle is small, and the scenery seen during framing is close to the original object, with strong sense of reality; The framing magnification is small and the viewing angle is large, so it is easy to see the panorama when framing. If the magnification is too small, it is difficult to observe the details of the object, which is not conducive to composition and focusing, and there is a great difference between the object and the image, which makes it very uncomfortable to take pictures.

Field of view refers to the ratio of the scene range seen through the viewfinder to the scene range shot by the bottom film, expressed as a percentage. Generally, the picture seen from the viewfinder is not completely the shot picture, but always smaller than the shot picture, generally 90% ~ 100%. Therefore, SLR only basically avoids parallax, and only the framing range of 100% can be called no framing parallax.

References:

Baidu encyclopedia-viewfinder