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Coronado 30mm Blocking Filter  - Straight through

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We’re sorry this item is temporarily out of stock. We’ll update it as soon as we’ve received more inventory.

Coronado BF-30 (straight through) 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 3,000mm focal length, with precision machined 2" barrel diameter. Requires 2" focuser.

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