How to make the effect of long exposure of SLR camera?

Open the shutter for a long time so that the photosensitive element of the camera can "see" the movement of the object.

Long exposure photography, usually used for night photography, to produce photos different from those during the day. By extending the shutter opening time of the camera, you can absorb more light and create a clearer picture. Usually fixed with corner frames to avoid ambiguity. And enlarge the aperture to avoid underexposure, resulting in dark photos.

With this technology, the scene will remain quite dark, and the photographer or assistant will take a light source, which can be a small flashlight, and move it to draw a picture. The light source can be turned off between different strokes. Objects in the scene that don't usually move will be depicted by briefly turning on studio lights, one or more flash lights or gradually expanding apertures.

Extended data:

Long exposure photos are usually taken in bulb mode rather than at standard shutter speed. B mode allows us to freely choose exposure lasting more than 60 seconds. Another healthy practice when using long exposure is to turn on the ISO noise reduction setting, because even at low ISO sensitivity, the amount of aurora reaching the sensor may cause noise in the final image.

This is due to a phenomenon called "hot pixels", in which some pixels of the camera sensor do become very hot and generate noise. When our image is enlarged to 100%, this noise is considered as a red/green/blue pixel in our image.