CORONADO - 30 mm blocking filter
Coronado BF-30 (integreatet in a 2" Adapter) type secondary blocking filter. The blocking filter is the second element in any Coronado H-alpha system, it is just as crucial to your safety and the system's performance as the front element.
Cannot be used without an SM front cell. Secondary interference filter for full disc image of the Sun for telescopes up to >1500mm focal length.
In the Box
|Telescope side connection||2"|
|Eypiece side connection||2"|
|Made for telescope||focallenght >1500mm|