Antlia Triband RGB Ultra Filter 2"

This filter is designed for light pollution suppression for OSC and monochrome cameras while presenting more balanced RGB colors.

♦ suitable to shoot galaxies, reflection nebulae and star clusters, not only emission nebulae

♦ excellent halo suppression and improved signal-to-noise performance

♦ specifically designed for balanced color transmission

♦ only minimal color cast to broadband emission objects such as stars, galaxies, and globular clusters

♦ usable with nearly all systems as fast as f/2

♦ luminance filter replacement for imaging continuum emitting objects with monochrome cameras

♦ can be used visually for observing deep-sky objects with large-diameter telescopes

 

Antlia Triband RGB Ultra Filter

It is designed for light pollution suppression for OSC and monochrome cameras. The spectral design selected the most substantial information in the RGB bands, which makes Antlia Triband RGB Ultra Filter possible to shoot over 90% of deep sky objects, in addition to its excellent performance on emission nebula, different from other ultra-narrowband filters, it is able to capture galaxies, reflection nebulae, and star clusters from a Bortle 8 location to Bortle 1 while presenting more balanced RGB colors in your images. Also, it has a broad bandpass designed to cope with faster optics up to the f/2 focal ratio.

The quantum efficiency of the B channel in current CMOS sensors is often significantly lower than that of R and G channels. Antlia team was to provide a filter with a more realistic color 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 NGC 2264. 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 color of the photo is better balanced and easier to manage in post processing.

Application and Performance:

♦ It is workable 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.
♦ It has been specifically designed for balanced color transmission using Antlia´s experience in spectrum design.
♦ The balanced transmission allows the minimal color 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, [O III] 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 monochrome camera systems.
♦ It facilitates the imaging of most astronomical objects using all optical configurations down to f/2 focal ratio.
 

Peak transmission H-alpha:	>92% (at 656.3 nm)
Peak transmission [S II]:	>92% (at 671.6 nm and 672.4 nm)
Peak transmission [O III]:	>92% (at 495.9 nm and 500.7 nm)
Peak transmission [N II]:	>92% (at 658.3 nm and 654.8 nm)
Blocking:	≥OD4 at 300-1100 nm
Filter thickness:	2 mm +/-0.05 mm
Focal ratio:	Up to f/2

In the box:
♦ Filter
♦ Protective box