Antlia Triband RGB Ultra Filter
 Antlia Triband RGB Ultra FilterAntlia Triband RGB Ultra Filter 

Antlia Triband RGB Ultra Filter

  (1 Review)
✓ 2 year warranty


6x in stock shipped 1-2 working days

About this product

Model:  antlia_triband_rgb

This Antlia Triband RGB Filter is designed for light pollution suppression and can be used with both OSC and Mono cameras.

The filter has been carefully designed so spectral bandpass selectively passes the most substantial information within RGB bands which ensures the Triband RGB Ultra filter can be used for imaging 90% of deep sky targets including galaxies, reflection nebulae and star clusters from Bortle 8 to Bortle 1 locations.

Provides balanced RGB colour and works with optics as fast as F2.

Currently available in 2' mounted format only.


The Quantum Efficiency of the B channel in current CMOS sensors is often significantly lower than that in the Red and Green channels. The goal of the Antila team was to provide a filter with a more realistic colour balance for astrophotography from light polluted locations. The problem with the low blue wavelength efficiency becomes apparent when imaging reflection nebulae and blue stars. In CMOS sensors, the blue wavelengths also contain contribution from the stronger green spectrum, thereby affecting the balance of the blue colours. Many popular imaging objects contain reflection nebula with faint blue hues such the central part of NGC2264. Therefore, Antlia designed the Triband RGB Ultra Filter that not only retains the HSO emission signal but also increases the amount of Luminous flux of the blue B channel. By improving the blue wavelength transmission, the colour of the photo is better balanced and easier to manage in post processing.

Application and Performance

  • Designed to shoot galaxies, reflection nebulae and star clusters. 

  • Refined coating process makes the Triband RGB Ultra filters with excellent halo suppression and improved signal-to-noise performance.

  • Filter has been specifically designed for balanced colour transmission using Antlia's experience in spectrum design.

  • The balanced transmission facilitates a minimal colour cast to broadband emission objects such as stars, galaxies, and globular clusters.

  • The Triband RGB Ultra can be used with nearly all systems as fast as f/2 with minimal loss of efficiency or shifts in spectral response.

  • When shooting LRGB with mono cameras, unless you are wanting to image LDN (dark nebulae) the Triband RGB Ultra can be used as a luminance filter replacement for objects such as nebulae and galaxies to improve contrast and signal to noise ratio.

  • The Triband RGB Ultra is able to better isolate the H-alpha, O3 and blue spectrum from the background light pollution.

  • For visual use, the Triband RGB Ultra filter ensures the high transmittance of the HSO emission line and can be used for observing deep-sky objects with large-diameter telescopes.

  • The filter provides excellent flexibility and compatibility with both OSC and Mono camera systems.

  • Facilitates the imaging of most astronomical objects using all optical configurations down to f/2 focal ratio.



Technical Specifications

  H-alpha S-II O-III N-II
Wavelength 656.3nm 671.6 to 672.4nm 495.9 to 500.7nm 658.3nm to 654.8nm
Peak Transmission >92% >92% >92% >92%

≥OD4@ 300-1100nm

≥OD4@ 300-1100nm ≥OD4@ 300-1100nm ≥OD4@ 300-1100nm
Filter Thickness 2mm +/_0.05mm 2mm +/_0.05mm 2mm +/_0.05mm 2mm +/_0.05mm

Customer reviews

Average Rating (1 Review):  
Write a Review and share your opinions!

Rating (max 5):  
QC issues?
29 January 2023  | 

Got this filter a few weeks ago and opened it first today (29th of January) as I'm putting together a new rig only to discover the filter has a slight mark/nic on it! Very disappointing 😩 I will try it however to see if this shows up on images or not?


Please fill in the form below to ask a question.

Please add the two numbers