O-III Filter
The O-III astronomical narrowband filter passes only doubly ionized oxygen lines at 495.9 nm and 500.7 nm. FWHM is around 18 nm. Designed mainly for visual use, its narrow band suits large-aperture telescopes for greater light collection; small-aperture visual use is not recommended. Targets include emission nebulae, source-described planetary-type stars, and supernova remnants with line spectra. It primarily observes planetary-type stars and supernova remnants, also other nebulae, especially bright objects under severe light pollution, such as M42, the Orion Nebula. O-III means doubly ionized oxygen, OII singly ionized, and OI oxygen in its natural state. Source details: metal frame with M48*0.75 thread; high-quality aerospace aluminum; one-piece precision CNC manufacture; fine optical-instrument sandblasting and anodizing, with internal light suppression; permanent laser engraving. Packaging: PP plastic box with imported high-pressure white EVA lining; 340 g silver-card carton with high-density foam lining.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Product Specifications | 1.25'' 2'' |
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