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Push through city glow and bright Moon with ultra-narrow 3.5 nm FWHM passbands that isolate SII 671.6 nm and OIII 500.7 nm for striking bi-color images from OSC or mono rigs.
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Real, per-filter data: each unit ships with its own 0.1 nm-resolution spectrograph report (not a batch average) so you know the exact CWL, FWHM, and peak transmission.
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Jet-black backgrounds: average OD6 blocking (~0.0001%) across unwanted wavelengths suppresses airglow, LED spill, and gradients while preserving faint nebular structure.
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High transmission where it counts: ~90–95% peak T in both bands plus halo-suppression AR coatings and SiO₂ hard overcoat for tight stars and durable performance.
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Flexible capture workflows: run bi-color in one exposure on OSC for faster integrations, or pair with a Ha–OIII DualBand or single-line Ha to build full palettes with minimal filter swaps.
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DSLR and astro-CMOS friendly: integrated UV/IR block ensures clean stars on refractors; works with modified and unmodified DSLRs and high-QE OSC cameras.
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Drop-in compatibility: 2" mounted (M48×0.75) fits Altair magnetic holders, standard 2" wheels/drawers, and Altair Canon/Nikon lens-to-CMOS adapters; parfocal 1.85 mm glass eases swapping.
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Type: Dual-band ultra-narrowband (SII + OIII)
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OIII Band: CWL 500.7 nm, FWHM ~3.5 nm (tolerance ~±0.2 nm), T ~90–95%
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SII Band: CWL 671.6 nm, FWHM ~3.5 nm (tolerance ~±0.2 nm), T ~90–95%
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Blocking: Average OD6 over the majority of out-of-band visual wavelengths
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Optics: 1.85 mm parfocal glass, ~30 arcsec parallelism
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Coatings: UV/IR block, anti-reflection halo-suppression, SiO₂ hard overcoat
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Cell/Thread: 2" mounted, M48×0.75
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Cameras: OSC CMOS, mono CMOS/CCD, modified & unmodified DSLRs
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Use Cases: Extreme light pollution, bright-Moon sessions, short summer twilights, fast bi-color mapping
