What are the types of viewfinders?

The speed of digital camera replacement is very fast, and some of the corresponding accessories are also layered out. There are many kinds of viewfinders, so what are the types of viewfinders? What are the advantages and disadvantages of these viewfinder types?

Viewfinder types include: LCD viewfinder, optical viewfinder, TTL viewfinder, electronic viewfinder, and more. The characteristics of these types of viewfinders are described below.

Viewfinder type: LCD viewfinder

The LCD viewfinder is the LCD viewfinder, and the large night crystal display behind the digital camera is it. The LCD viewfinder has several obvious advantages: First, the image seen through it is the scene to be imaged, and the parallax is extremely low. Second, many LCDs of digital cameras are now designed to be rotatable. In this way, the digital camera has more viewing angles and can realize the self-timer operation very intuitively.

However, the shortcomings of the LCD viewfinder are also obvious. The first is the power consumption problem. For a long time, the LCD viewfinder is a big power consumer on digital cameras. Opening it for a long time will greatly shorten the working time of digital cameras. Fortunately, the new digital cameras now use a large number of low-temperature polysilicon liquid crystal displays, so the power consumption of the LCD viewfinder has been significantly improved, but it is still too much to call it "power-hungry." Secondly, in the strong sunlight, the display effect of the LCD viewfinder will be greatly affected, and it is necessary to block the light by hand or other things to understand. Finally, when the ambient light is too dark, the LCD viewfinder will also have a problem that the image is dim and unfavorable for framing.

Viewfinder type: optical viewfinder

Separated from the lens, it is generally called an optical viewfinder (previously used for point-and-shoot cameras). Regardless of whether the lens of the camera is fixed or zoomed, the viewfinder of the optical viewfinder is constant. It works independently of the lens, it just mimics the lens. Viewing angle and focal length. Most home-based idiot cameras (including home-grade digital cameras) use this framing method.

The size of the aperture of the viewfinder determines the clarity of the image. For users wearing glasses, it is more important to have a larger aperture, because the glasses will make their eyes farther from the viewfinder. This makes it impossible to accurately view the scene. Some viewfinders are equipped with a diopter adjustment function that allows the photographer to take more accurate framing without taking glasses when taking pictures. However, only near and farsightedness can be used for refractive adjustment. For normal vision photographers, diopter adjustment is meaningless.

The optical viewfinder should be as close as possible to the center of the optical axis of the lens to reduce the viewing parallax. The parallax occurs because the camera lens and the viewfinder view the subject from different positions, so there are some differences in the scenes they see. It is difficult to find parallax when the shooting distance is large, but when the shooting distance is small, such as shooting portrait or macro, the parallax will be obvious, which may affect the composition of the photo, which is why you need to open the LCD display when performing macro photography. The reason for the screen. The display shows the image received by the sensor, thus avoiding parallax.

Parallax is also a problem often encountered with stand-alone optical viewfinders, but camera manufacturers have adopted a number of methods to solve such problems. Optical viewfinders generally have a "trimming" or "parallax" symbol to indicate the actual shooting area, but This is just a simple method, not 100. In general, the optical viewfinder cannot display images taken with a 100 lens, which is roughly 85 or less of the actual frame. This is why the TTL viewfinder is being developed.

Viewfinder type: TTL viewfinder

The lens is commonly referred to as a TTL viewfinder (mostly for SLR cameras), which is typically used on more expensive digital cameras to display images captured by the lens. In traditional film cameras, the vast majority of these have been adopted.

Different TTL framing systems work differently, and the details that can be displayed are different in specific use, but they all achieve the purpose of framing by reflecting or scattering light passing through the lens. Therefore, for a digital camera using a TTL optical viewfinder, the image seen through the LCD screen and the viewfinder is identical.

The disadvantage of the TL viewfinder is that it is expensive because of the complexity of the production, so it is often only seen in high-end home digital cameras or professional digital cameras such as the Olympus E10, Fuji S1, etc. Moreover, TTL framing generally requires a smaller LCD display to display information such as focus, exposure, etc., thereby increasing its manufacturing cost.

Viewfinder type: electronic viewfinder

This viewfinder has the same advantages as the TTL viewfinder: it displays the full view of the scene to be photographed, can be seen in daylight, and can display shooting information such as aperture and shutter speed, but in addition, it can display the camera menu. It is impossible for other viewfinders.

The shortcomings of the electronic viewfinder can be summarized into three: unlike the optical viewfinder and TTL viewfinder, it requires a large amount of power; similar to the LCD display, it is easy to reflect light, which affects the accuracy of the framing; it is rough compared with the optical system. The last item will be important because such a system cannot display the smallest details in the frame, such as whether the human eye is open or not.

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