Astrographic filter for astronomical telescope.

General celestial photography does not need a filter except neutral density filter to shoot the sun. If you take infrared photography, you need to remove the low-pass filter of the camera. When shooting stars, in order to reduce the influence of background light on shooting, red filters can also be used, which will play a certain role. These filters should also be added to the objective lens. The bigger the aperture, the better. Of course, it also depends on economic affordability.