Antlia Triband RGB Ultra II 2" Mounted Filter

Description:
The Antlia Triband RGB Ultra II 2" mounted filter is designed for astrophotographers aiming to capture emission nebulae in H-alpha, OIII, and SII bands using a single color camera. It precisely isolates the desired spectral lines while suppressing unwanted light and city pollution. With transmission exceeding 90% on each target line and strong IR/UV blocking, it delivers outstanding image quality even under urban skies.

Its spectral design is based on over a decade of Antlia’s experience and provides balanced RGB colors, ideal for faint galaxies and deep sky objects. Compatible with both OSC and mono cameras, the filter performs reliably even on fast optical systems down to f/2. It features highly durable optical glass with fine flatness and mechanical stability.

Technical specifications:

• Type: 2" mounted filter

• Spectral bands:

  • H-alpha: 656.3 nm

  • NII: 658.3 nm

  • SII: 671.6 nm / 673.1 nm

  • OIII: 495.9 nm / 500.7 nm

  • H-beta: 486.1 nm

• Transmission:

  • H-alpha > 92 %

  • SII > 92 %

  • OIII > 92 %

  • H-beta > 92 %

• Blocking: > OD4 from 300 to 1050 nm

• Thickness: 2 mm ± 0.05 mm

• Mount: M48 thread (2" mounted)

• Coating: Multilayer, anti-scratch high durability

Additional information:
The Triband RGB Ultra II filter supports high transmission for fast systems and large diameter scopes. It’s an excellent tool for OSC and mono imaging under various sky conditions. Balanced color rendering, minimal halos, and sharp spectral cutoff make it suitable for capturing both LRGB and narrowband features in a single frame.