Coronado BF-10 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 1000mm focal length.
Product carries full one year Meade factory limited warranty (within US/Canada only).
Manufacturer part number: BF10
Mar 20, 2019
Extremely expensivePros: Cons: Comments:
I does the job. This is a basic 1.25" mirror diagonal (that would cost $50) with an ITF (the maier photonics equivalent would cost $75 and the BelOptik equivalent about $200) and the blocking filter itself. This mens that we are paying about $350-$400 for a 10mm blocking filter. To me this is expensive.
I'm using it in a PST modification stage 2 with a 70/700 donner. It works.
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