Optolong 2" Filter Set with H-Alpha, SII, and OIII Filters

The Optolong 2" Filter Set includes three premium narrowband filters—H-Alpha (7nm), Sulfur-II (6.5nm), and Oxygen-III (6.5nm)—designed for capturing extraordinary detail in deep-sky imaging. Crafted with precision and ion-assisted deposition coatings on Schott glass, these filters offer remarkable contrast, blocking out both natural and artificial light pollution for stunning astrophotography results.

Each filter is housed in a CNC-machined, black anodized metal cell that ensures structural integrity and minimal thickness. The result is a clear 45mm aperture for uncompromised field coverage. This set is ideal for monochrome cameras and filter wheels, and is perfect for creating highly detailed and color-rich Hubble-style images.

• Filter Type: Narrowband (H-Alpha, SII, OIII)
• Filter Size: 2" (50.8 mm) threaded
• Optical Thickness: Approx. 1.85 mm
• Shape: Round
• Insert Style: Threaded
• Glass: Schott substrate with IAD multi-coating
• Transmission:
  • H-Alpha: 656 nm, 7 nm bandwidth
  • SII: 672 nm, 6.5 nm bandwidth
  • OIII: 500 nm, 6.5 nm bandwidth
• Infrared Blocking: Yes (700–1100 nm range)
• Warranty: Optolong – 2 Years

• Optolong 2" 7nm H-Alpha Filter
• Optolong 2" 6.5nm SII Filter
• Optolong 2" 6.5nm OIII Filter
• Filter Case