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The Antlia Triband RGB Ultra filter is designed for light pollution suppression for OSC and Mono cameras. The spectral design selected the most substantial information in the RGB bands, that enables the Antlia Triband RGB Ultra Filter to shoot over 90% of deep sky objects. In addition to its excellent performance on emission nebula, what makes it different from other ultra-narrowband filters is the ability to capture galaxies, reflection nebulae, and star clusters from a Bortle 8 location to Bortle 1 while presenting more balanced RGB colours in your images. Also, it has a broad bandpass designed to cope with faster optics up to 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. The Antlia team was able to design 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, we designed the Antlia Triband RGB Ultra Filter to not only retain the HSO emission signal but to also increase the amount of Luminous flux of the blue B channel. By improving the blue wavelength transmission, the colours in the photo are better balanced and easier to manage in post processing.
Application and Performance:
Filter Cell (specifications for cell mounted filters only):
- 2” (M48*0.75)
- Ultra-thin filter cell to minimize vignetting by maximizing possible clear aperture
- Black Anodized Finish
- Non-Fading Laser Engraving
Available Sizes：
- Mounted： 2” (2mm thickness)