The Antlia HB-OIII filter is designed for high-contrast visual observation of nebulae and deep-sky astrophotography. It offers 90% or greater transmission at key wavelengths:

• OIII 500.7nm

• OIII 495.9nm

• H-Beta 486.1nm

This filter delivers a significant contrast boost, making it easier to observe planetary nebulae, supernova remnants, emission nebulae, diffuse nebulae, and even the faintest nebulae.

When used for deep-sky astrophotography, the HB-OIII filter enhances fine OIII and H-beta emission line detailswith astronomical cameras and DSLRs.

Key Applications and Performance:

• The filter features optical density (OD)4 suppression of unwanted wavelengths, blocking light outside the 300-1000nm range.

• This extended IR suppression outperforms typical visual filters, which usually block only to OD3 at 350-750nm.

• The result is a darker sky background, making nebulae, star clusters, and galaxies stand out more clearly in both visual observation and photography.

• Under light-polluted or dark skies, the HB-OIII filter helps faint objects appear sharper and brighter. You’ll enjoy near-photographic views of targets like the Veil Nebula, Dumbbell Nebula, and Orion Nebula.

Visual Use Recommendation:

Since the human eye struggles with low-light sensitivity at night, we recommend using a large-aperture telescope (8-inch or larger). A bigger aperture collects more light and directs it to your eyes, maximising the filter’s contrast-enhancing effects.

Filter Ring:

Antlia standard thread:1.25”(M28.5*0.6)，2”(M48*0.75 pitch)

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

Black Anodized Finish

Laser Engraving No Fading

Not Recommended:

Solar imaging and observing

DO NOT LOOK AT THE SUN WITH THIS FILTER!

Serious eye damage will result if you fail to observe the warning.