Why Purchase from All-Star Telescope?
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Product Description
L-Para is a brand new dual narrowband 10nm light pollution filter. The FWHM of L-Para is 10nm for OIII (500.7nm) and H-Alpha (656.3nm) respectively. The transmittance of nebulae emission lines at are both greater than 85% in system with focal ratios of F2 and above. It 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 both normal optical systems and fast optical systems, such as RASA and Hyperstar systems.
Even when light is incident at an oblique angle, it can still maintain high transmission rates to provide you with 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.
Specifications
| Substrate | Optical Glass |
| Thickness | 1.85mm |
| FWHM | OIII: 10±0.5nm | Ha: 10±0.5nm |
| Transmittance | T>85% @ 500.7nm & 656.3nm |
| Blocking Range | 300-1000nm |
| Blocking | OD ave>4 |
| Surface quality | 60/40 |
Additional Articles, Videos, and Links
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