Optolong L-Extreme 1,25" filtr dual band (Ha + OIII)

Optolong L-Extreme 1.25" Dual-Band Astrophotography Filter (Hα + OIII)

Capture stunning images of luminous emission nebulae with ease, even under challenging light pollution conditions, using the Optolong L-Extreme 1.25" Dual-Band Filter. Designed specifically for digital SLRs and monochrome cameras, this essential tool is perfect for astrophotography enthusiasts aiming to achieve exceptional results.

This innovative filter allows for the transmission of over 90% of light from the key spectral lines of ionized hydrogen (Hα) and oxygen (OIII) atoms. With a narrow half-width of just 7 nm, it effectively separates the OIII line from Hβ. The filter's narrow bandwidth, combined with its capability to efficiently block out spectral lines from sodium and mercury lamps, ensures crisp, high-contrast images even in light-polluted urban environments. Additionally, the narrow bandwidth significantly enhances contrast during moonlit nights and when capturing emission nebulae near bright stars.

For superior optical performance, the Optolong L-Extreme filter is crafted with a full multi-layer anti-reflection coating, applied through advanced ion implantation techniques. This not only optimizes optical properties but also ensures high durability and scratch resistance.

Key Features of the Optolong L-Extreme 1.25" Filter:

• Dual-band filter designed for high transmission of Hα and OIII lines.
• Exceptional light pollution blocking efficiency exceeding 99%.
• Robust multi-layer anti-reflective coating for scratch resistance.

Technical Specifications:

• Filter Type: Dual-band filter
• Filter Diameter: 1.25"
• Half Bandwidth: 7 nm
• Pass Bands: Hα, OIII
• Maximum Transmission: Over 90%
• Blocking Range: 300 - 1000 nm
• Light Pollution Blocking Efficiency: >99%
• Filter Material: Schott B 270 glass
• Coating Type: Full multi-layer coating (FMC)
• Filter Thickness: 1.85 mm
• Surface Quality Index: 60/40
• Parallelism: 30"
• RMS Execution Accuracy: λ / 4
• Frame Material: Aluminum

Kit Components:

• Optolong L-Extreme 1.25" Filter

Warranty:

Enjoy peace of mind with a 24-month warranty.

In summary, the Optolong L-Extreme 1.25" Dual-Band Filter is your gateway to capturing breathtaking images of emission nebulae, even in light-polluted areas. With its advanced technology and superior optical characteristics, this filter is an indispensable tool for astrophotographers seeking to reveal the beauty of the night sky.