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Antlia 3nm Narrowband Oxygen III (OIII) Pro Filter - 50mm x 50mm Square Unmounted

Product Descriptions
Size 50mm X 50mm Unmounted Price US$750
CWL 500.7nm FWHM 3nm
Filter Model OIII  Narrowband Brand Antlia

Antlia OIII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia OIII 3nm Pro filters are designed to deliver 88% transmission at the 500.7nm line which provides you with the maximum signal and well defined nebulae structures.

Conventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL) shift. We guarantee T>88% within 1nm range of the center bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue shift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f/3 with minimal loss in emission signal and meets the requirements of fast optics.

The out of band blocking specification is rated OD5 (0.001%) which delivers an excellent SNR(signal to noise ratio) and effective cut off rate to minimize interference from other wavelengths. Improved sharp cut off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.


Application and Performance:

High transmittance and smallest bandwidth to maximize contrast

Steep spectral profile minimizes halos around bright stars

A single substrate to eliminate internal reflections   

Narrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants

Use in light polluted areas and dark sites

Extends imaging time when the moon is up

Antlia narrowband Pro filters can be used down to f/3 systems with minimal loss of signal

All Antlia unmounted narrowband filters are edge blackened to eliminate internal reflections from stray light

Superior optical reliability reduces post image processing

This filter is only effective for deep sky objects that contain OIII emissions


Technical Specifications:

Basic Substrate: Optical, Single / Non-glued substrate

Filter Thickness: 2mm+/-0.05mm for 1.25”, 2” mounted, Dia31mm and Dia36mm unmounted

3mm+/-0.05mm for Dia50mm and square 50x50mm unmounted

FWHM (Full width at half maximum): 3nm

CWL (Central Wavelength): 500.7nm

Peak Transmission: >88%

Blocking: > 5 OD(0.001% out of band blocking) @ 300-1000nm

Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)

Transmitted Wavefront: Lambda/4 or better.

Parallelism: less than 30 arcsec


Warranty: 3-years against delamination


Spectrum Curve:

Antlia OIII 3nm Pro Curve.png


Filter Ring:

1.25''(M28.5*0.6),2'' (M48*0.75)

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


Available Sizes:

Mounted:   1.25'', 2''

Unmounted:Dia31mm,Dia36mm,Dia50mm, square 50x50mm


Not Recommended:

Solar imaging

Night visual observation


Not Permitted:

DO NOT LOOK AT THE SUN WITH THIS FILTER

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


LRGBR+ Dark series
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