Broadband filters have a wider range because a narrow transmission range causes a fainter image of sky objects, and since the work of these filters is revealing the details of nebulae from light polluted skies, it has a wider transmission for more brightness. These filters are particularly designed for galaxy observation and photography, and not useful with other deep sky objects such as emission nebulae. However, they can still improve the contrast between the DSOs and the background sky, which may clarify the image. See also Infrared cut-off filter List of telescope parts and construction Optical filter Photographic filter Photometric system UBV photometric system References Optical telescope components Astrophotography Astronomical imaging Optical filters