Optolong L-Para 2" 10nm Dual Narrow Band Filter

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Optolong L-Para 2" 10nm Dual Narrow Band Filter

The L-Para is a new 10nm Dual Narrow Band Light Pollution Filter designed for imaging emission nebulae.

The transmittance of the nebulae emission lines is greater than 85%  when used with optical systems with focal ratios of F2 and above. The L-Para effectively filters out mercury lamps, sodium lamps, and LED light pollution emission lines. 

At the same time, it has excellent contrast and anti-halo characteristics, allowing you to capture detailed and vivid nebula images. L-Para is suitable for normal and fast optical systems, such as RASA and Hyperstar. 

Even when light is incident at an oblique angle, the L-Para can maintain high transmission rates to provide a clear and precise shooting experience.

Features

Broad Compatibility: A dual narrowband filter suitable for all telescope systems, adaptable to fast optics (focal ratios of F2, F2.8, F3.2, F4) as well as various standard/normal focal ratio telescopes.

Light Pollution Reduction: Effectively cuts off emission lines from mercury lamps, sodium lamps, LEDs, and other light pollution sources, making it applicable to Bortle Scale1- 7 dark skies. 

High Transmission: In systems with a focal ratio of F2 and above, nebula emission lines OIII and Ha transmittance exceeds 85%, resulting in higher imaging efficiency.

Excellent Contrast: The high transmittance of nebula emission lines (OIII & Ha) combined with a deep cut-off of light pollution bands significantly improves image contrast and detail richness.

Anti-Halo Characteristics: The design has undergone several rounds of optimisation and repeated testing, resulting in a marked improvement in anti-halo performance, enhancing the capture of bright stars.

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