Antlia Filters OIII 2.5nm Ultra: Precision Narrowband for Deep Sky Excellence

The Antlia OIII 2.5nm Ultra series stands at the forefront of narrowband filter technology, tailored for the discerning astrophotographer who demands the utmost precision and performance. Constructed from high-grade quartz glass and benefiting from meticulously controlled coating processes, the OIII 2.5nm Ultra filter promises a FWHM of 2.5nm +0.3/-0.1nm, with transmission efficiency soaring between 93-95% at the central wavelength.

Key Features:

• Ultra-Narrow FWHM: At 2.5nm +0.3/-0.1nm, it ensures the capture of fine details in nebulae and other deep sky objects.
• High Transmission Rates: Achieves >93-95% at the OIII line, enhancing signal clarity.
• Advanced Material: Quartz glass with an ultra-low thermal expansion coefficient for superior durability.
• Improved Signal: Estimated to boost image signal by 20-30%.
• High SNR: Exceptional signal to noise ratio for clear, noise-free deep sky images.
• Environmental Resilience: Designed to withstand the rigors of demanding research and imaging conditions.

Usage and Safety Guidelines:

• Solar Safety Warning: Not intended for solar observation or imaging; risk of serious eye injury if used to view the sun.
• Night Observation: Not suitable for visual observation at night due to high specificity for OIII emissions.

Astrophotographers seeking to elevate their deep sky imaging will find the Antlia OIII 2.5nm Ultra to be an indispensable addition to their equipment. Its ability to discern and enhance the faintest celestial whispers makes it a powerful tool for both amateur enthusiasts and professional researchers. With the Antlia OIII 2.5nm Ultra filter, capturing the universe's most elusive details becomes a breathtaking reality.

Specifications

• Narrow FWHM: 2.5nm +0.3/-0.1nm for Hydrogen-alpha, Sulfur-II, and Oxygen III to ensure detailed contrast.
• Peak Transmission: High efficiency with Ha/SII at 95% and OIII at 93%.
• Central Wavelengths: Precisely set at 656.3nm for Ha, 672.4nm for SII, and 500.7nm for OIII.
• OD5 Blocking: Advanced blocking to minimize interference and star halos.
• Quartz Glass Material: Offers exceptional durability, thermal stability, and resistance to scratches.
• Uniform Thickness: Consistent 2mm ±0.05mm across all filters for parfocality.
• Optimized for Fast Optics: Recommended for use with ≥ f/3.5 focus ratio for optimal performance.
• Quality Assurance: Each filter is individually scanned to verify transmission and blocking data.
• Edge Coating: Ensures elimination of internal reflections from stray light.
• Filter Ring Specs: Standard 1.25’’ (M28.50.6) and 2’’ (M480.75) sizes available with an ultra-thin cell.
• Durable Finish: Black anodized with laser engraving to prevent fading.
• 3-Year Warranty: Against delamination, ensuring long-term reliability.