Optolong L-Para 2" Dual Band Filter

The Optolong L-Para 2" Dual Band Filter is your powerful companion for astrophotography under light-polluted skies. Engineered to isolate the H-alpha and OIII wavelengths with a 10nm bandwidth, this dual-band filter allows color camera users to produce richly detailed and color-balanced emission nebula images in a single exposure.

Designed for use with fast optics, the L-Para performs beautifully on systems like RASA and HyperStar. Its exceptional light transmission—over 85%—ensures vivid nebulosity, while its anti-reflective coating and precise optical design minimize halos, even around bright stars. Whether you’re imaging from a backyard in the city or a remote observatory, the L-Para brings out extraordinary OIII and Ha details with impressive clarity and natural color balance.

• Filter Type: Multi/Dual Narrow Bandpass
• Size: 50.8mm (2")
• Filter Shape: Round
• Insert Style: Threaded (M48 x 0.75)
• Bandwidth: 10 nm
• Wavelengths:
  • OIII: 500nm
  • H-alpha: 656nm
• Transmission: ≥85% at focal ratios f/2 and above
• Design Features: Halo-free, natural color balance
• Material: B270 glass with multi-layer AR coating
• Compatibility: Fast systems (RASA, HyperStar, etc.)

• Optolong L-Para 2" Dual Band Filter