Bulb mode is a special shooting mode that will let you take really long exposures. It allows you to keep the camera's shutter open for as long as you like (or until the camera's battery runs out). You're not likely to find it as feature of most point & shoot cameras, but it can be found on most more advanced cameras.
Most cameras that feature bulb mode allow up to 30 second exposure times in normal modes. This is more than enough for most situations. During the daytime a typical exposure time will be around 1/500s to 1/160s, a pretty quick shutter speed. But if you're out in the middle of nowhere at night, then a shutter speed of over 30 seconds may be necessary.Read the rest of this entry »