What does digital camera shutter speed bulb mean?

The digital camera shutter speed bulb means that the camera's "B-door" is a function that can be exposed for a long time. With this function, it can be exposed for several seconds, minutes or even hours, and it is an essential shutter function for celestial photography and fireworks night shooting.

Long exposure is a photography method to select the shutter in photography (long exposure time) so as to achieve special photography effect. BuLb, also known as manual shutter, means that when the shutter is pressed, the shutter opens and exposure begins, and when the shutter is released, the exposure stops. The exposure time of door B is determined by the length of the shutter pressing time, and it can be controlled freely without setting the exposure time.

Use of digital camera shutter bulb:

1. Door B can be used at night or in dark environment for long exposure. For example, if you choose a low ISO value and a small aperture, in order to get enough exposure (or the exposure according to your calculated time), the B door can be accurately controlled.

2. Special shooting, such as shooting in the starry sky (it takes a long time to accumulate exposure).

3. Lightning shooting (it means that when waiting for shooting, when lightning is expected to come in the dark, open door B, when lightning comes, close door B, and you can see the lightning imaging in the photo. If it takes a long time and there are a lot of lightning, you can photograph several lightning flashes appearing in the picture at the same time. ) expand the information

Advantages of digital camera:

1. You can see the pictures immediately after taking pictures, thus providing the possibility of immediately retaking dissatisfied works and reducing the occurrence of regrets.

2. Just pay for those photos that you want to develop, and other unnecessary photos can be deleted.

3. Color reproduction and color range no longer depend on the quality of film.

4. The sensitivity is no longer fixed by the film, and the photoelectric conversion chip can provide a variety of sensitivity choices.

5. The product structure is relatively simple, the appearance is more exquisite, and the product is becoming more and more portable.

6. The digital camera is simple, clear and easy to use.

Disadvantages of digital camera:

1. Due to the conversion between imaging elements and image processing chips, the imaging quality is less layered than that of optical cameras.

2. Due to the different technologies of image processing chips of various manufacturers, the colors of the imaged photos are different from the actual objects.

3. Due to the lack of core technology in China, the later use and maintenance costs are high.

Baidu encyclopedia-long exposure