CHF 399
In stock with supplier
The Antlia OIII Pro narrow-band filter optimizes the width at half-maximum (FWHM) to 3nm. This narrow width enhances the contrast of emitting targets by reducing spurious background signal. It is designed to offer 88% transmission at 500.7nm wavelength, guaranteeing maximum signal and excellent definition of nebulous structures.
Wider narrowband filters generally result in a significant loss of transmission due to center wavelength shifts (CWL). The 3nm Pro filter guarantees >88% transmission in a ±1nm range around the center band, enabling compatibility with high-speed optics up to f/3 without significant signal loss.
Out-of-band rejection is rated at OD5 (0.001%), offering an excellent signal-to-noise ratio and effective cutting of spurious wavelengths. This filter is designed to minimize halos around bright stars, thanks to its sharp spectral profile.
| Parameter | Value |
|---|---|
| Substrate | Optics, unglued monoblock |
| Filter thickness | 2mm ±0.05mm (1.25″, 2″, 31mm, 36mm), 3mm ±0.05mm (50mm, 50x50mm) |
| FWHM | 3nm |
| Center wavelength (CWL) | 500.7nm |
| Maximum transmission | >88% |
| Out-of-band discharge | OD5 (0.001%) from 300 to 1000nm |
| Surface quality | S/D 60/40 (MIL-O-13830 standard) |
| Transmitted wavefront | λ/4 or better |
| Parallelism | < 30 arcsec |
| Warranty | 3 years against delamination |
NEVER LOOK AT THE SUN WITH THIS FILTER. Serious eye damage may occur.
