Optolong 3nm SHO 2" Mounted Filter Kit

The Optolong 3nm SHO 2" Mounted Filter Kit includes three premium astrophotography filters—H-alpha, OIII, and SII—each with a 3nm ultra-narrow bandpass for precise signal isolation. Designed for high-contrast imaging of emission nebulae, this set is ideal for creating Hubble-style images with mono CCD or CMOS cameras.

Each filter selectively transmits light in its target wavelength (Ha at 656nm, OIII at 500nm, and SII at 672nm), while blocking out unwanted artificial and skyglow interference. The result: cleaner, richer data and breathtaking structure in your deep sky targets. Crafted with high-transmission coatings using ion-assisted deposition and housed in precision-machined 2" threaded filter cells, this kit provides top-tier performance and durability for serious astrophotographers.

• Filter Type: SHO Narrowband (H-alpha, SII, OIII)
• Filter Size: 50.8 mm (2")
• Filter Shape: Round
• Insert Style: Threaded
• Wavelength Centers:
  • H-alpha: 656 nm
  • OIII: 500 nm
  • SII: 672 nm
• Bandwidth: 3 nm (per filter)
• Optical Coatings: Multi-layer anti-reflection, ion-assisted deposition
• Glass: Schott substrate with non-cemented coatings
• Applications: Monochrome CCD/CMOS and modified DSLR cameras
• Warranty: Optolong – 2 Years

• H-Alpha 3nm CCD 2" Filter
• OIII 3nm CCD 2" Filter
• SII 3nm CCD 2" Filter
• Three Plastic Cases