Antlia Filters 7nm Prime Narrowband Filters (36mm): Precision Imaging for Astrophotography

The Antlia Filters 7nm Prime Narrowband Filters in 36mm size are expertly crafted for astrophotography, offering unmatched quality and performance. These filters are not recommended for solar imaging or night visual observation and should never be used for direct solar observation, as serious eye damage can result. Antlia's commitment to excellence is evident in their meticulous design process, focusing on out-of-band blocking rate, transmittance, and band-pass parameters to complement astronomical imaging systems. Each filter undergoes rigorous individual testing and strict quality control, ensuring they meet high-performance standards. Renowned for their exceptional quality at an affordable price, Antlia Filters provide a superior price-to-performance ratio compared to similar premium filters, making them an ideal choice for astrophotographers seeking top-tier results without compromising on safety or budget.

Specifications

HA

• High Transmittance: Over 90% at H-alpha 656.3nm central wavelength.
• Broad FWHM: 7nm, effectively passing H-alpha and NII lines.
• Ideal for Fast Optics: Suitable for f/2 optics with minimal signal loss.
• Spectral Profile: Steep design to reduce star halos.
• Single Substrate: Eliminates internal reflections.
• Narrowband Targets: Suitable for H-alpha, NII Emission Nebulae, Planetary, Wolf Rayet Nebulae, and Supernova Remnants.
• Versatile Use: Effective in both light-polluted and dark sky environments.
• Edge Blackening: All unmounted filters to prevent stray light reflections.
• Optical Reliability: Minimizes the need for post-processing.
• Deep Sky Effectiveness: Targets objects with H-alpha and NII emissions.
• Technical Specs: Optical single substrate, 2mm±0.05mm thickness for Dia36mm unmounted, FWHM of 7nm, CWL at 656.3nm.
• Blocking Efficiency: Over 4OD (0.01%) between 300-1000nm.
• Surface Quality: 60/40 scratch/dig (MIL-O-13830 standard).
• Wavefront Accuracy: Lambda/4 or better.
• Precision Parallelism: Under 30 arcsec.
• 3-Year Warranty: Covers delamination.

OIII

• 90% Transmittance: At OIII 500.7nm central wavelength.
• Wider FWHM: 7nm, suitable for fast optics like f/2 with minimal signal loss.
• Spectral Profile: Steep design reduces halos around bright stars.
• Single Substrate: Prevents internal reflections.
• Ideal for Narrowband Objects: Including OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae, and Supernova Remnants.
• Versatile Use: Effective in both light polluted areas and dark sites.
• Edge Blackened: All unmounted narrowband filters to minimize stray light reflections.
• Optical Reliability: Reduces need for extensive post-image processing.
• Deep Sky Efficiency: Especially for objects with OIII emissions.
• Technical Build: Optical, single/non-glued substrate; 2mm±0.05mm thickness for Dia36mm unmounted.
• Central Wavelength: CWL at 500.7nm.
• High Blocking Rate: Over 4OD (0.01% out of band) between 300-1000nm.
• Surface Quality: 60/40 scratch/dig (MIL-O-13830 standard).
• Wavefront Accuracy: Lambda/4 or better.
• Precise Parallelism: Less than 30 arcsec.
• 3-Year Warranty: Protection against delamination.

SII

• Substrate: Optical quality, single, non-glued.
• Thickness: 2mm (±0.05mm) for Dia36mm unmounted.
• FWHM: 7nm bandwidth.
• CWL: Central wavelength at 671.6nm.
• Transmission: Over 90% peak transmission.
• Blocking: Above 4OD (0.01% out of band) between 300-1000nm.
• Surface Quality: 60/40 scratch/dig (MIL-O-13830 standard).
• Wavefront: Lambda/4 transmission quality.
• Parallelism: Under 30 arcsec.