Antlia SII 3 nm Pro Highspeed Filter 2 Filters for Astronomy opinie

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The Antlia SII 3nm Pro Highspeed 2" is a narrowband imaging filter optimized for fast optical systems with focal ratios between f/2.6 and f/3.6. Its pre-shifted central wavelength provides strong SII emission contrast and excellent signal-to-noise performance even under light-polluted skies.

Key features

• optimized for fast f/2.6–f/3.6 optical systems via a pre-shifted central wavelength
• 3 nm FWHM offering strong contrast in the sulfur SII emission line
• peak transmission of about 90%
• compensation of blue-shift effects typical of fast optical systems
• off-band blocking to at least OD5 (0.001%) within 300–1000 nm
• single-substrate optical design minimizing internal reflections and halos
• ultra-thin 2" filter cell minimizing vignetting
• black anodized housing with laser-engraved, non-fading markings
• suitable for imaging emission nebulae, planetary nebulae and supernova remnants
• effective under both light-polluted and dark skies, including during bright Moon phases
• not intended for visual observing or for solar observation
• manufacturer warranty: 3 years against coating delamination

Included items

• Antlia SII 3nm Pro Highspeed 2" filter in M48×0.75 threaded cell

Technical specifications

• filter type: narrowband, sulfur SII
• diameter: 2" (mounted)
• thread: M48×0.75
• full-width at half maximum (FWHM): 3 nm
• central wavelength (CWL): 673.6 nm (pre-shifted for fast optical systems)
• peak transmission: about 90%
• off-band blocking: ≥ OD5 (300–1000 nm)
• recommended focal ratio: f/2.6–f/3.6
• applications: emission nebulae, planetary nebulae, supernova remnants
• substrate: optical-grade single substrate, non-glued
• surface quality: scratch/dig 60/40 (MIL-O-13830)
• transmitted wavefront: λ/4 or better
• parallelism: <30″ (arcseconds)
• filter thickness (2" mounted): 2.0 mm ±0,05 mm
• not recommended uses: visual observing, solar observing

Warning: NEVER look at the Sun through the Antlia SII 3nm Pro Highspeed 2" filter. Ignoring this warning can cause permanent eye damage.