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The Antlia 3nm Pro Ultra Narrowband filter set includes the following items: Antlia H-Alpha 3nm filter Antlia OIII 3nm filter Antlia SII 3nm filte...
ALP-T Dual Band 5nm Filter is best suited for optics f-ratios slower than f/3.6, the standard Antlia ALP-T Dual Band filter is highly recommended. ...