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1. 96% transmission at 486nm (H-beta) 2.95% transmission at 496nm (OIII) 3.92.5% transmission at 501nm (OIII) 4.98% transmission at 656nm (H-alpha) 7.Ideal All-round Deep Sky filter even for small telescopes 8.Not sensitive to humidity or aging International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.