Antlia HB-OIII filter is engineered specifically for night visual nebulae observation at a high contrast and Deep-sky astrophotography. Its transmission is 90% or greater at critical wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm). You’ll notice much higher contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula, and extremely faint nebulae by Antlia HB-OIII filter.

When it is used for Astro Deep-sky imaging, it enhances the details of the OIII and H-Beta emission lines with astronomical cameras and DSLRs.

Main Application and Performance:

Antlia HB-OIII filter was coated with almost total suppression of optical density (OD)4 on unwanted wavelength and the filter cut-off wavelength is 300-1000nm, which meets the spectral requirements of photographic cameras and further enhances the suppression of the IR region, compared with the visual filters with a cut-off depth of OD3@350-750nm, it performs better to darken the sky background and make deep-sky observation and photography of nebulae, star clusters, and galaxies more easily.

The HB-OIII filter helps faint objects become much more visible against the blackened background and produces near-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under both light-polluted and dark skies.

Since human eyes are less sensitive at night, large aperture telescopes are recommended to gather light and funnel it into the observer's eyes.

Technical Specifications:

	Oxygen III	Oxygen III	H-Beta
CWL (Central Wavelength)	500.7nm	495.9nm	486.1nm
Peak Transmission	＞90%	＞90%	＞90%
Blocking	OD4@ 300-1000nm
Filter Thickness	2mm+/-0.05mm
Basic Substrate	Optical, Single, Non-glued substrate
Surface Quality	S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
Transmitted Wavefront	Lambda/4 or better
Parallelism	less than 30 arcsec

Filter Ring:

1.25’’(M28.5*0.6)

Ultra-thin filter cell to minimize vignetting, Black anodized finish, Laser engraving No fading

Spectrum Curve:

Not Recommended:

Solar imaging and observing

Not Permitted:

DO NOT LOOK AT THE SUN WITH THIS FILTER

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