Antlia Filters H-Beta - OIII 1,25" (85528)

The Antlia HB-OIII filter features an almost complete optical density (OD4) coating at key wavelengths, with a cut-off range of 300-1000 nm. This design meets the spectral requirements of astronomical cameras and offers enhanced suppression of the infrared range. Compared to standard visual filters, which typically have an OD3 cut-off from 350-750 nm, this filter more effectively darkens the sky background, making it easier to observe and photograph deep sky objects such as nebulae, star clusters, and galaxies.

With the HB-OIII filter, faint celestial objects become much more visible against a darkened background, providing nearly photographic views of targets like the Veil, Dumbbell, and Orion nebulae—even under light-polluted skies. For visual observation, large-aperture telescopes are recommended due to the limited sensitivity of the human eye at night.

Specifications

• Coating of optical system: Multiple coatings

• Frame: 1.25"

• Transmission: Greater than 90%

• Surface accuracy: 1/4 wave

• Type: Filter

Area of Application

• Useful for photographs: Yes

• Visually useful: Yes

• Nebulae and galaxies: Yes

• Anti light-pollution: Yes

• Planetary nebulae: Yes

• Hydrogen nebulae: Yes

• Supernova remnants: Yes

• Galaxies and star clusters: Not specified