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.
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.
Jet-black backgrounds: average OD6 blocking (~0.0001%) across unwanted wavelengths suppresses airglow, LED spill, and gradients while preserving faint nebular structure.
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.
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.
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.
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.
