C2 Swan-Band Filter 15nm O-III 2"
Baader
From ~$169.55
2 stores
In stock
The Baader C2 Swan-Band Filter is a specialized narrowband filter designed specifically for comet observation and imaging, isolating the two brightest C2 (diatomic carbon) emission lines at 511 and 514nm. With a 15nm half-bandwidth (FWHM), this CMOS-optimized filter blocks adjacent OIII lines and stray light, dramatically enhancing the visibility of comet gas tails even under light-polluted skies or unfavorable observing conditions. Featuring Baader's proprietary Front-Reflex-Blocker hard coating, Life-Coat sealed edges, and blackened edges for maximum contrast, this filter delivers exceptional clarity for distinguishing gas-dominated comets from dust-tail dominated objects.
Specifications
| Filter Size | 2 in |
| Primary Emission Lines | 511 |
| Model Number | FSWAN-2 |
| Filter Thread | M48 |
| Coating Type | Front-Reflex-Blocker with Life-Coat |
| Optimization | CMOS-optimized |
| Half-Bandwidth (FWHM) | 15 |
| OIII Blocking | Blocks OIII line at 501nm and below |
| Central Wavelength | 512 |