Lumicon 2 Inch SCT Rear Cell Hydrogen-β FilterLumicon 2 Inch SCT Rear Cell Hydrogen Filter aids in viewing of extremely faint nebulous objects such as the Horsehead, Cocoon and California Nebulae. Lumicon 2 Inch SCT Rear Cell Hydrogen Filter Lumicon 2 Inch SCT Rear Cell Hydrogen Beta Filter is also known as the Horsehead Nebula filter. This filter isolates only the hydrogen beta line of the spectrum (486nm) in a narrow pass band just 9nm wide, providing maximum contrast. The filter cell threads
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