What does exposure time mean?

Question 1: What is exposure time? What is the role of long exposure time? Exposure time is the time from when the camera shutter opens to when it closes, when light hits the film or photoreceptor.

What is the role of long exposure time?

1. If other parameters remain unchanged, the longer the exposure time, the brighter the photo will be;

2. Long exposure can capture more motion trajectories, such as taking silk-like photos. Running water and linear car lights require long exposure.

3. When the light is insufficient, long exposure is also required, such as shooting night scenes, starry sky, etc.

Question 2: What is the difference between exposure time and shutter speed? The simplest way to put it is: shutter speed affects exposure

Exposure is affected by shutter speed and aperture size. In popular terms, exposure is Time is the same as shutter speed, which is why your question arises, but officially there is no such thing as exposure time. It should be said that it is the exposure amount rather than the exposure time.

If you must talk about exposure time, you must put aside the influence of aperture. You can understand it this way: when the aperture is the same, a faster shutter speed means a shorter exposure time, and a slower shutter speed means a longer exposure time. For example: when the aperture is F2.8, a shutter speed of one thousandth of a second will produce a shorter exposure time than a shutter speed of one hundredth of a second.

Let’s talk about exposure:

You also know that a camera actually uses film (film camera) or CCD (digital camera) to store the projection of light, so in the film or CCD The amount of light saved affects the lightness and darkness of the photo. If there is little light saved, it will be darker, and if there is a lot of light saved, it will be brighter. If the amount of light is neither too much nor too little, it can be said that the exposure is normal, too much means overexposure, and too little means underexposure.

The camera controls the amount of exposure through shutter and aperture. To borrow an analogy from others, this camera is like a faucet. The amount of water is equivalent to the exposure. You can control the amount of water by turning it on and off for a certain time and adjusting the diameter of the water pipe. The opening and closing of this faucet is equivalent to the camera shutter. The speed and aperture are equivalent to the camera aperture. When you have the same diameter, the longer you turn it on, the greater the water volume; when you turn it on for the same time, the larger the diameter of the water pipe, the greater the water volume.

In summary (-_-! It’s the same as writing a paper), the exposure is determined by both the shutter speed and the aperture size. Therefore, it is not appropriate to just talk about the exposure time. We should talk about the exposure amount.

Question 3: What does long exposure in photography mean? That is to say, when shooting, use a very slow shutter speed (ranging from a few seconds to a few hours), and set the aperture and other values ??accordingly to achieve a very unique shooting effect.

This was taken by me, the shutter speed is 30s

Not necessarily, it depends on the camera’s nominal slowest shutter speed. This was taken by me with D90, 30s. I will think about it later. No matter how slow it is, you have to use B. You have to check the watch yourself. The slowest mark of the Seagull 205 rangefinder still in use is 1s, and it will also be B after that. If it is a fully automatic small card camera, it will be a bit more troublesome, because you You cannot set the shutter speed yourself, but if you have a long-exposure shooting mode, you can generally have a 15s shutter speed.

Question 4: What does the photo exposure time mean? Exposure, in layman's terms, is how much light the machine absorbs in order to take this photo. You can understand it as the brightness of the photo. The higher the exposure, the brighter the photo. Exposure time is the time required to achieve this exposure. That is the shutter speed

Question 5: What does "exposure for 30 seconds" mean when taking pictures?" The shutter opens and closes to complete an exposure image

"Exposure for 30 seconds" Once opened, after 30 frames of exposure, the shutter is closed.

The light trajectory during this period is recorded

Question 6: What does exposure time mean? The exposure time is the same as the shutter opening time, which is the shutter speed used.

Hope to adopt.

Question 7: What does exposure mean? What effect does the length of exposure have on the image? How to control exposure? The aperture is opened for a period of time, and the light enters the aperture and is projected on the photosensitive element to form an image

Aperture index, shutter time, ISO, these three affect the exposure

If you expose too much, the photo will appear The image will be bright, otherwise, it will be dark

Question 8: What is the meaning of exposure time and shutter time? Correction: The structure of the camera is as follows: film (or CCD of digital camera), usually It was placed in a dark box that was not exposed to light

When taking pictures, there was a hole in the wall of the box facing the film, which was controlled by a device to pull it open. Once, let the light come in, shine on the film, and leave an image.

This device that controls the opening is called the shutter, and the process of light hitting the film is called exposure

The faster the shutter speed, the shorter the exposure time; The slower, the longer the exposure time.

It takes a certain amount of time or a certain amount of light intensity for the film to undergo a chemical reaction to receive light from a uniform chemical substance.

Generally speaking: in order to ensure the quality of the image To be clear, in broad daylight, the shutter speed should be faster to prevent too much light from coming in; at night, the shutter speed should be slower to allow enough time for the image to be formed. Therefore, shooting stars generally requires a long exposure time to form.

In addition, the amount of light entering is also related to the size of the small hole mentioned earlier. This small hole is called the aperture. The larger the aperture, the greater the amount of light entering. The smaller the aperture, the smaller the amount of light entering.

When a fixed amount of light is required, if a large aperture is selected, the shutter speed must be set faster; if a small aperture is selected, the shutter speed must be set slower

It is also related to the reaction speed of the film. This parameter is called sensitivity (ISO). If the sensitivity value is high, the film will respond quickly and the amount of light required will be smaller; if the sensitivity value is low, the film will respond slowly. The required amount of light input is large

When a fixed amount of light input is required, the amount of light input controlled by the aperture and shutter of the former is twice less than that of the latter< /p>