Antlia 3nm High Speed Ha,OIII and SII Filters

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Antlia 3nm High-Speed Ha, OIII and SII Filters

Antlia's SHO 3nm Pro Highspeed Filters are further optimised for high-speed imaging systems by pre-shifting the centre wavelength. This specially optimised version will provide significantly higher SNR (Signal to Noise Ratio) for fast telescopes with focal ratios between f/2.6 and f/3.6 compared to the standard 3nm Pro version.

Initially, these filters will be available only in 36mm and 2" sizes. 50mm Round and Square options will also be available later.

The optical light path of a telescope is cone-shaped, which creates an angle, and the centre wavelength of the interference filter will shift toward shorter (blue) wavelengths as the angle of incidence((AOI) increases; the greater the angle, the greater the shift. The amount of beam deviation depends on the refractive index and the thickness of the substrate. The blue shift data shown by simulation indicates that at a focal ratio of f/2.6, the light cone's incidence angle is 10°and its bandwidth shifts 2.2nm to shorter wavelengths. Therefore, the Highspeed 3nm Pro narrowband filters are designed to be pre-shifted by 1.2nm towards the longer (red) end to compensate for the Blueshift and ensure high signal acquisition by telescopes with fast focal ratios.

These highspeed SHO 3nm Pro narrowband filters for telescopes with a focal ratio between f/2.6 and f/3.6 show stronger data with higher contrast than the standard Pro versions.

For optical f-ratios slower than f/3.6, the standard 3nm Pro filters are highly recommended. Meanwhile, if you use optics faster than f/2.6, the 4.5nm EDGE filters are the best choice.

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