Astronomik SII 6nm CCD Filter
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 specifications 6nm 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
Specifications
- Size
- 1.25 inch (M28/5), 2 inch (M48), Canon EOS APS-C Clip, Canon EOS XL Clip, Canon EOS R XL Clip, Canon EOS M Clip, Sony alpha 7 Clip, Nikon XL Clip, Nikon Z XL Clip, Pentax K-1 Clip, T-Mount (M42x075), 31mm, 36mm, 50mm, M49, M52, 27mm Unmounted, 42mm Unmounted, 50 x 50mm Unmounted, MaxFR 1.25 inch (M28/5), MaxFR 2 inch (M48), MaxFR Canon EOS APS-C Clip, MaxFR Canon EOS XL Clip, MaxFR Canon EOS R XL Clip, MaxFR Sony Alpha 7 Clip, MaxFR Nikon XL, MaxFR Nikon Z XL, MaxFR 31mm, MaxFR 36mm, MaxFR 50mm, MaxFR M52, MaxFR 50 x 50mm Unmounted
Variants (32)
- 1.25 inch (M28/5) — 330.00 AUD — In stock
- 2 inch (M48) — 760.00 AUD — In stock
- Canon EOS APS-C Clip — 480.00 AUD — In stock
- Canon EOS XL Clip — 780.00 AUD — In stock
- Canon EOS R XL Clip — 820.00 AUD — In stock
- Canon EOS M Clip — 510.00 AUD — In stock
- Sony alpha 7 Clip — 810.00 AUD — In stock
- Nikon XL Clip — 780.00 AUD — In stock
- Nikon Z XL Clip — 820.00 AUD — In stock
- Pentax K-1 Clip — 780.00 AUD — In stock
- T-Mount (M42x075) — 690.00 AUD — In stock
- 31mm — 400.00 AUD — In stock
- 36mm — 480.00 AUD — In stock
- 50mm — 760.00 AUD — In stock
- M49 — 780.00 AUD — In stock
- M52 — 780.00 AUD — In stock
- 27mm Unmounted — 330.00 AUD — In stock
- 42mm Unmounted — 570.00 AUD — In stock
- 50 x 50mm Unmounted — 780.00 AUD — In stock
- MaxFR 1.25 inch (M28/5) — 430.00 AUD — In stock
- MaxFR 2 inch (M48) — 1050.00 AUD — In stock
- MaxFR Canon EOS APS-C Clip — 630.00 AUD — In stock
- MaxFR Canon EOS XL Clip — 1070.00 AUD — In stock
- MaxFR Canon EOS R XL Clip — 1080.00 AUD — In stock
- MaxFR Sony Alpha 7 Clip — 1080.00 AUD — In stock
- MaxFR Nikon XL — 1080.00 AUD — In stock
- MaxFR Nikon Z XL — 1080.00 AUD — In stock
- MaxFR 31mm — 540.00 AUD — In stock
- MaxFR 36mm — 630.00 AUD — In stock
- MaxFR 50mm — 1050.00 AUD — In stock
- MaxFR M52 — 1070.00 AUD — In stock
- MaxFR 50 x 50mm Unmounted — 1080.00 AUD — In stock
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