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BF10 Coronado 10mm Blocking Filter BF10 Coronado Blocking Filters for SolarMax Front Filters are the second element in any Coronado H-Alpha Filter system, it is just as crucial to your safety and the system's performance as the front element. Use the following guidelines for selecting which Blocking Filter you need based on the focal length of the telescope being used. If you are switching to a longer focal length solar telescope you can purchase blocking filters separately. There is no advantage for visual use in using a larger blocking filter than required based on the focal length. The Coronado Blocking Filter is not a stand alone...  

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Please select option for this product:*   BF10: Coronado 10mm Blocking Filter BF10
  BF15: Coronado 15mm Blocking Filter BF15
  BF15ST: Coronado 15mm Blocking Filter - 1.25in Straight Through - BF15ST
  BF30: Coronado 30mm Blocking Filter BF30
  BF5: Coronado 5mm Blocking Filter BF5
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