GONG Hα Instrument
GONG Hα Instrument
GONG Hα Instrument
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Prototype Optical DesignPBSFCCDL1L2L3L4PBS - polarizing beamsplitter, RMI customL1- plano convex lens, f=450 mm, OptoSigma 011-2358-A55L2- plano convex lens, f=800 mm, OptoSigma 011-2770-A55F- H-alpha filter, d=32 mm, Daystar Quantum PE 0.4AL3- positive achromat, f=300 mm, OptoSigma 026-1380L4- negative achromat, f=-100 mm, Edmund NT62-494Not shown: Fold mirror, Edmund K30-258Diffuser, Luminit L1P6MD-73 1°September 22, 2009 <strong>GONG</strong> H-alpha Review 5