Optolong L-Para Dual Band 10nm Filter
L-Para (L-Parallels) 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 lamp, sodium lamp, 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
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 Resistance:
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 Rate:
In systems with a focal ratio of F2 and above, the transmittance of nebula emission lines OIII and Ha exceed 85%, resulting in higher imaging efficiency.
Excellent Contrast:
The high transmittance of nebula emission lines (OIII & Ha) combined with deep cut-off of light pollution bands significantly improves image contrast and detail richness.
Anti-Halo Characteristics:
The design has undergone several round of optimizations and many times of repeated testing ,resulting in a marked improvement in anti-halo performance, enhancing the capture of bright stars.
Coating Technology
- Multi-layers anti-reflection coating
- Non-cementing optical substrate coating
- Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.
- Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.
Spectrum
According to the characteristics of the emission lines of celestial bodies and light pollution, as well as the characteristics of the normal telescope and fast ratio imaging system, L-Para has been maintaining high transmittance at OIII and Ha while blocking light pollution emission lines.
At The Widescreen Centre, we prioritize prompt order processing and dispatch. We strive to dispatch all orders on the same day or the next working day, depending on the time of your order. We hold extensive stocks to ensure that your items are ready for immediate despatch. Please note that the cut-off time for same-day dispatch is usually 1:30 p.m.
For delivery within Mainland UK, we use reputable couriers to provide efficient service. You can expect your package to arrive in 1-2 working days. Please note that a signature may be required upon delivery to ensure a secure receipt.
In the case of special order items, the delivery time may be longer. If you have any concerns or questions about the delivery of your item, please don't hesitate to Contact Us. We are here to assist you.
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Please be aware that The Widescreen Centre cannot be held responsible for any postal or third-party delays that may occur. We are committed to providing a reliable and efficient delivery service for our valued customers.
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