The Antlia IR Pass 685nm filter lets infrared light with wavelengths above 685nm pass through while blocking shorter wavelengths. Since the human eye loses sensitivity at these longer wavelengths, this filter isn’t suitable for visual observation—but it excels in planetary imaging.

By operating in the infrared range, this filter reduces the impact of atmospheric turbulence (seeing), which sharpens planetary images. The closer you get to the infrared band, the less atmospheric distortion affects your results, delivering sharper, higher-contrast images.

You can combine luminance data captured with the IR Pass filter alongside RGB and UV-Venus filters to significantly enhance overall image sharpness and capture planetary details across multiple bands.

This filter also makes it possible to image planets during daylight. The 685nm IR Pass filter darkens the background sky, allowing clearer daytime planetary captures.

• Mercury reveals faint surface details only with an IR-pass filter, especially useful during daytime when it darkens the bright sky background.

• Venus shows cloud patterns more clearly when paired with the Antlia UV Venus filter.

• Mars benefits most from this filter, revealing far more detail in infrared than visible light. During global dust storms, it helps cut through the haze to expose hidden surface features.

• Jupiter displays sharper, more detailed bands, minor vortices, and fine structures only visible in infrared.

• Saturn reaches peak sharpness in infrared, with the filter enhancing views of features like the Encke Division in larger telescopes.

• Uranus and Neptune, though distant and low in contrast, become more photographically interesting through IR-pass imaging.

Because the human eye can’t detect infrared, this filter is designed for cameras paired with medium to large telescopes.
For apertures over 150mm, the Antlia IR-pass 850 offers even greater contrast.

Precision manufacturing keeps substrate tolerance within ±0.05, ensuring these filters remain parfocal with your setup.

Filter Ring:

1.25”( 28.5*0.6 )

Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture

Black Anodized Finish

Laser Engraving No Fading