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Antlia 7nm Narrowband Sulfur II (SII) Prime Filter - 36mm Unmounted

Product Descriptions
Size 36mm Unmounted Price US$158.00
CWL 672.4nm FWHM 7nm
Filter Model SII Narrowband Brand Antlia

Antlia SII Prime narrowband filter optimizes the FWHM (full width half maximum) to 7nm bandpass. The suppression of optical density is (OD)4 on unwanted wavelengths. The excellent optical coating characteristics found in the Antlia 3nm Pro series has been incorporated into the 7nm Prime narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.

Antlia SII 7nm Prime filters are designed to achieve 90% transmittance at the central wavelength (CWL) of 672.4nm. Furthermore, these filters highly transmit the SII emission lines at 671.6nm and 673.1nm, ensuring maximum signal strength and well-defined nebular structures.

The out of band blocking specification is rated OD4 (0.01%) 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 7nm Prime filters are designed to minimize halos around bright stars.

Antlia 7nm Prime filters can be used with nearly all systems as fast as f/2 with minimal loss in emission signal and meets the requirements of fast optics.


Application and Performance:

90% transmittance at Central Wavelength 672.4nm

High transmittance to pass SII emission lines at the 671.6nm and 673.1nm

With wider FWHM, 7nm Prime narrowband filters can be used with fast optics of f/2 with minimal loss of signal

Steep spectral profile minimizes halos around bright stars

A single substrate to eliminate internal reflections

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

Use in light polluted areas and dark sites

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

Superior optical reliability reduces post image processing

This filter is ffective for deep sky objects that contain SII emissions


Technical Specifications:

Basic Substrate: Optical, Single / Non-glued substrate

Filter Thickness: 2mm+/-0.05mm for Dia36mm unmounted

FWHM (Full width at half maximum): 7nm

CWL (Central Wavelength): 672.4nm

Peak Transmission: >90%

Blocking: > 4OD(0.01% 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 SII 7nm Prime filter spectrum curve.png



Available Sizes:

Unmounted Dia36mm


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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