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

Product Descriptions
Size 36mm Unmounted Price US$158
Brand Antlia Origin China

Antlia SII Prime narrowband filter optimizes the FWHM (full width half maximum)


Application and Performance:

90% transmittance at Central Wavelength SII 671.6nm

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): 671.6nm

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.jpg


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


When we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the out of band blocking rate, transmittance and band-pass parameters to achieve an optimum result. Each filter is individually tested and scanned by strict QC to ensure that the quality meets the high-performance parameters. The result is that Antlia is known for designing filters for astrophotography that achieve exceptional quality and performance parameters at affordable prices. We believe the price to performance ratio compares more favorably than similar premium filters in the market.



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