How to Set Super Long Exposure for Canon 7d Camera

Canon camera needs 7d long exposure, which can be exposed by B-door. It is recommended to use cable release or timing remote control for door B exposure. Because B-door exposure has more noise than normal exposure, slight particles may appear in the image. In the custom function settings, the long exposure and mania reduction functions can be set to automatic or on to reduce mania. The following is a screenshot of the user-defined function settings in the camera manual-long exposure and mania reduction.