Coronado 5MM BLOCKING FILTER - BF5

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This may be the last BF5 available anywhere :) Highlights Blocking filter for Coronado primary filters Secondary interference filter for full disc image of the Sun for telescopes u p to 500mm focal length Coronado BF-5 right angle (1.25" diagonal) 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 500mm focal length. Warning: Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger. User level: Advanced T-max tuner: Yes Show more