Application of Precision Ray Exposure Compensation and Surrounding Exposure
- Oct 25, 2019
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First-time photographers may find it difficult to master accurate exposure, because there is really no so-called most accurate exposure in reality. Besides, many scenery, light and composition are fleeting when shooting. It is impossible to test exposure slowly, so photographers often have to be as accurate as possible. Nowadays, cameras have the functions of high-speed continuous shooting and Auto-enclosure exposure, so long as you know how to use it, it will be very helpful. The following edition teaches you how to use this function of high-speed continuous shooting and surround exposure more skillfully in this article, hoping to help you make better works.
Exposure is difficult to be completely accurate
Photometer technology of cameras has existed as early as the Philippine era, mostly reflective photometry, that is, measuring the reflected light of the main body. Based on the fact that most cameras can only use the reflectivity of about 18% gray as the standard, it is unavoidable that sometimes the exposure deviation is caused by the change of the reflectivity, such as inadequate exposure of white objects and photography of black objects. Overexposure. Especially in the fierce outdoor sunshine, it is very difficult to judge the exposure by the LCD screen of the camera. If the exposure can be surrounded in the scene, the success rate of taking photos can be guaranteed.
In the case of intense sunlight, it is difficult to judge whether the exposure of a photograph is accurate by the LCD screen of the camera alone.
Exposure Compensation vs Surrounding Exposure
Some photographers, as long as they have enough experience, can also make exposure compensation on their own in real time when they meet some scenes with larger light-dark contrast or deviation from 18% gray reflectivity. They can increase or reduce the exposure by pressing the +/-button of the camera to make up for the errors caused by light measurement and solve the exposure deviation. However, people have wrong hands and horses have lost their hoofs. Even if the compensation is added or subtracted, they may carelessly turn in the wrong direction. As a result, the camera has always retained the function of Exposure Bracketing, which is an indispensable built-in function of the camera. In fact, these two functions have their own advantages and disadvantages. Exposure compensation is one step in place, fast enough, but it must require experience. Surrounding exposure can be safer, and the exposure of adding or subtracting can also be photographed. The problem is that it is not appropriate to take dynamic pictures, because the best one X may not be in the best exposure.
Exposure compensation can add or subtract exposures in real time, and "compensate" the exposure obtained by photometry according to the added or subtracted values. It is common practice to use exposure compensation when encountering scenes with high reflectivity, such as white or backlight, or to use exposure reduction compensation when dark or black scenes.
Unlike adding or subtracting exposure compensation, the surround exposure function takes at least three pictures. Some cameras can adjust and take 2, 5 or 7 pictures with different exposure degrees. The difference of exposure can be adjusted by yourself, such as 1EV, 2EV, etc. If you want to take +/-1EV, the camera can automatically adjust the exposure Time-1 continuously. Photos of +0 and + 1EV.
Exposure compensation and surround exposure are combined into one
Therefore, it is advisable to use both of them. Even for surround exposure, exposure compensation can also be added. The camera can compensate and surround exposure according to the photometric value. For example, when shooting beach or snow scenery with high reflectivity, most of the automatic photometric exposures of the camera are underexposed and grey. It is better to first expose + 1EV and then surround it with every EV. That is to say, +0EV, +1EV and+2EV are taken separately. Most of the 0EV photos are underexposed, so we can choose the best one of the + 1EV and + 2EV photos. Zhang. Of course, for today's digital cameras, adding or subtracting the first and a half levels has little effect. If necessary, the series of surround exposure can be separated a little more. With this method, we can still judge the need of adding or subtracting exposure according to the environment, but we can take several different exposures continuously for insurance purposes.
The surround exposure can be added or subtracted at the same time. However, it should be noted that the interval series of surround exposure should be set in advance. Some cameras are within 1EV, while others are within 3EV, depending on the camera.
Accelerate the completion of continuous shooting
Although the use of surround exposure is automatic, it may be too slow if you press the shutter one by one. It is suggested that it can be completed with the camera's high-speed continuous shooting. Under the shutter, most cameras will stop after taking a set of surround exposure, which will be easier to use and faster. Because many cameras nowadays have continuous shooting speed of 5 FPS or more, high-speed continuous shooting surrounds exposure. As long as the hand-held camera is as stable as possible, even without a scaffold, the same image can be taken, but it can not take high-speed dynamic subjects, or capture very fast moments. In fact, many new generation cameras have HDR or multi-frame noise reduction functions, which are combined through high-speed continuous photographs.
Nowadays, the continuous shooting speed of the camera is more than 5 fps. With the high-speed continuous shooting of the camera and surrounding exposure, all levels of exposure can be photographed continuously in one breath. As long as the camera is stably handheld, the brightness is enough and the shutter is fast enough, the same image can be taken in one second.
Automatic Enclosure Exposure + Exposure Compensation (Exposure Compensation: +1EV, Enclosure per EV)
When shooting some scenes with high reflectivity or backlight, we usually use + exposure compensation to compensate for the lack of exposure, but only one shot is not safe enough, we can also use surround exposure, such as surround five. When no exposure compensation is made, it is surrounded by - 2EV, - 1EV, 0EV, +1EV and+2EV, but after + 1 exposure compensation, all values are +1 as shown in the picture above. Since the exposure of - 2EV will be more insufficient, it will be better to compensate for the fact that the exposure will be biased.
Pay attention to shutter and aperture. Better use RAW.
When using surround exposure, be aware that when using aperture priority or shutter priority, the shutter and aperture may be out of range. In addition, when using P, the shutter and aperture may change. It is also suggested that you take RAW files as far as possible. Nowadays, the RAW files of the cameras can be big three or four exposures, and the quality of the pictures is not too bad.