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 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.
