Skeleton text
Skeleton text
Skeleton text
Skeleton text
Skeleton text
Skeleton text
Skeleton text
Astronomik
Astronomik SII 6nm CCD Filter
$330.00
Astronomik SII 6nm CCD Filter
Capture SII nebulae. Half the stars. Twice the contrast.
A 6nm bandpass at 671.7nm and 673nm isolates ionised sulphur (SII) emission with 93% typical transmission. Sharper narrowband astrophotography images from light-polluted skies, without compromise.
View specifications6nm
FWHM bandwidth
Halves stars vs 12nm
93%
typical transmission
At both SII lines
671.7nm
SII emission
+673.0nm second line
f/4
to f/15 (MFR)
f/2.2–f/6 with MaxFR
Spectral performance
6nm, centred on SII. Nothing else gets through.
The transmission curve confirms what the specs describe. The 6nm window is precisely centred on the SII doublet at 671.7nm and 673.0nm. H-alpha, at 656nm, is fully excluded. Everything from UV to IR outside the passband is blocked.
Technical specifications.
Optical Performance
Target emission lines
671.7nm and 673.0nm (ionised sulfur, SII)
FWHM bandwidth
6nm
Typical transmission
93% at both SII lines (671.7nm and 673.0nm)
Guaranteed transmission
More than 90% at both SII lines
Blocking range
All wavelengths outside passband, from UV to IR
Diffraction-limited
Yes, no reduction in telescope resolution or contrast
H-alpha exclusion
Optimised to block H-alpha (656nm) for high colour contrast in HSO imaging
Physical
Glass thickness
1mm
Glass specification
Finely polished; free of striae, residual stresses, and bubbles
Parfocal
Yes, parfocal with all other Astronomik filters
Coating type
MFR (standard) or MaxFR (fast optics)
Coating durability
Extremely scratch-resistant; resistant to high humidity and ageing
Country of manufacture
Germany
Delivered in
High-quality, long-lasting filter box with individual spectral data label
Focal Ratio Compatibility
MFR coating
f/4 to f/15 without significant performance loss
MaxFR coating (full performance)
f/2.2 to f/6
MaxFR at f/2
Approximately 90% of maximum transmission
Camera Compatibility
CCD cameras
Very good, huge contrast enhancement at SII emission nebulae
CMOS astrophotography cameras
Recommended, particularly suited to cameras with low dark current
DSLR (astro-modified)
Very good
DSLR (MC modified)
Very good
DSLR (unmodified)
Unsuitable
Visual observation
Unsuitable
Available Formats
Threaded cells
1.25″ (M28.5), 2″ (M48), T-Mount (M42×0.75)
Filter wheel rounds
27mm unmounted, 31mm, 36mm, 42mm unmounted, 50mm, 50×50mm² unmounted, M49, M52
Clip-filter mounts
Canon EOS APS-C, EOS XL, EOS R XL, EOS M; Sony alpha 7; Nikon XL, Nikon Z XL; Pentax K-1
MaxFR availability
Available across all major sizes and clip-filter mounts
Precision narrowband imaging in Australia, backed by Bintel.
Australian warranty
Full local cover
Ships from Sydney
From local stock
Expert advice
From working astronomers
40+ years
In Australian astronomy
Store locator
WANT TO KNOW MORE ABOUT THIS PRODUCT?
Let Gemini, ChatGPT or Claude help you. Click a button and ask away.
Astronomik SII 6nm CCD Filter
Capture SII nebulae. Half the stars. Twice the contrast.
A 6nm bandpass at 671.7nm and 673nm isolates ionised sulphur (SII) emission with 93% typical transmission. Sharper narrowband astrophotography images from light-polluted skies, without compromise.
View specifications6nm
FWHM bandwidth
Halves stars vs 12nm
93%
typical transmission
At both SII lines
671.7nm
SII emission
+673.0nm second line
f/4
to f/15 (MFR)
f/2.2–f/6 with MaxFR
Spectral performance
6nm, centred on SII. Nothing else gets through.
The transmission curve confirms what the specs describe. The 6nm window is precisely centred on the SII doublet at 671.7nm and 673.0nm. H-alpha, at 656nm, is fully excluded. Everything from UV to IR outside the passband is blocked.
Technical specifications.
Optical Performance
Target emission lines
671.7nm and 673.0nm (ionised sulfur, SII)
FWHM bandwidth
6nm
Typical transmission
93% at both SII lines (671.7nm and 673.0nm)
Guaranteed transmission
More than 90% at both SII lines
Blocking range
All wavelengths outside passband, from UV to IR
Diffraction-limited
Yes, no reduction in telescope resolution or contrast
H-alpha exclusion
Optimised to block H-alpha (656nm) for high colour contrast in HSO imaging
Physical
Glass thickness
1mm
Glass specification
Finely polished; free of striae, residual stresses, and bubbles
Parfocal
Yes, parfocal with all other Astronomik filters
Coating type
MFR (standard) or MaxFR (fast optics)
Coating durability
Extremely scratch-resistant; resistant to high humidity and ageing
Country of manufacture
Germany
Delivered in
High-quality, long-lasting filter box with individual spectral data label
Focal Ratio Compatibility
MFR coating
f/4 to f/15 without significant performance loss
MaxFR coating (full performance)
f/2.2 to f/6
MaxFR at f/2
Approximately 90% of maximum transmission
Camera Compatibility
CCD cameras
Very good, huge contrast enhancement at SII emission nebulae
CMOS astrophotography cameras
Recommended, particularly suited to cameras with low dark current
DSLR (astro-modified)
Very good
DSLR (MC modified)
Very good
DSLR (unmodified)
Unsuitable
Visual observation
Unsuitable
Available Formats
Threaded cells
1.25″ (M28.5), 2″ (M48), T-Mount (M42×0.75)
Filter wheel rounds
27mm unmounted, 31mm, 36mm, 42mm unmounted, 50mm, 50×50mm² unmounted, M49, M52
Clip-filter mounts
Canon EOS APS-C, EOS XL, EOS R XL, EOS M; Sony alpha 7; Nikon XL, Nikon Z XL; Pentax K-1
MaxFR availability
Available across all major sizes and clip-filter mounts
Precision narrowband imaging in Australia, backed by Bintel.
Australian warranty
Full local cover
Ships from Sydney
From local stock
Expert advice
From working astronomers
40+ years
In Australian astronomy
Recently viewed products
- Choosing a selection results in a full page refresh.
- Opens in a new window.