Jixing photography

Because shooting the starry sky requires a long exposure, it is necessary to accurately grasp the specific exposure time. But it is also inseparable from the set sensitivity (high sensitivity leads to short exposure time) and aperture size (large aperture leads to short exposure time).

Exposure time is the time when the shutter is opened in order to project light onto the photosensitive surface of photographic photosensitive materials. It depends on the sensitivity of photographic photosensitive materials and the illumination on the photosensitive surface. If the exposure time is long, there will be more light, which is suitable for poor light. Short exposure time is suitable for good light.

Extended data

During this time, the object can leave an image on the negative, and the exposure time depends on the need. There is no difference between good and bad, only need.

For example, it takes a long exposure time (maybe several hours) to photograph the trajectory of the stars, so that the long-term trajectory of the stars will be imaged on the negative. If you want to take a clear picture of a high-speed car, it takes a short time (usually a few thousandths of a second). If the exposure time is long, there will be more light, which is suitable for poor light. Short exposure time is suitable for good light.