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

Description

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:

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 toge