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

The Optolong 2" Filter Set is a comprehensive seven-filter collection designed for serious astrophotographers using monochrome cameras. It includes Luminance, Red, Green, Blue (LRGB), plus three narrowband filters—H-Alpha, OIII, and SII. With this complete toolkit, you can capture stunning true-color and narrowband composite images with outstanding clarity, contrast, and detail. Each filter is precision-engineered from high-quality Schott glass and housed in threaded 2" metal filter cells for seamless integration into your imaging train.

Whether you're targeting planets, galaxies, or emission nebulae, this set offers unmatched flexibility. The LRGB filters deliver natural hues and sharp details for broadband imaging, while the narrowband filters isolate key emission lines to produce dramatic SHO or HOO images. Designed to block infrared wavelengths and enhance contrast, this set is ideal for both light-polluted and dark-sky environments. For astrophotographers looking to maximize creative freedom and image quality, this set is an essential asset.

• Filter Type: RGB + Narrowband Set (Ha, OIII, SII)
• Filter Size: 50.4mm (2")
• Shape: Round
• Insert Style: Threaded (M48 x 0.75)
• Materials: Schott glass, CNC-machined aluminum housings
• Filter Bandwidth:
  • H-Alpha: 7nm @ 656nm
  • OIII: 6.5nm @ 500nm
  • SII: 6.5nm @ 672nm
• LRGB Transmission:
  • OIII overlaps in Blue/Green for natural colors
  • Red/Green gap blocks Sodium 589nm emission line
  • Infrared wavelengths (700–1100nm) blocked
• Coatings: Multi-layer anti-reflection with Ion-assisted deposition
• Surface Quality: 60/40
• Clear Aperture: Full 2" (full-frame sensor compatible)

• Optolong 2" Luminance Filter
• Optolong 2" Red Filter
• Optolong 2" Green Filter
• Optolong 2" Blue Filter
• Optolong 2" 7nm H-Alpha Filter
• Optolong 2" 6.5nm SII Filter
• Optolong 2" 6.5nm OIII Filter
• Filter Case