SolarMax 40mm H-alpha filter with T-Max and 15mm blocking filter | under 1500mm focal length

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This 40mm aperture H-alpha filter can be used with virtually any telescope - but is designed to work best with telescopes having a focal length up to 1500mm. The front filter element (containing the ERF and etalon) requires an optional custom mounting plate to attach to your specific telescope. The filter is provided with a 15mm clear aperture blocking filter mounted in a 1.25" right angle star di . . .
SKU: SM4015