Optolong L-Para 2" Dual-band Filter Dovetail Fully multi-coated lens elements: All

Fully multi-coated lens elements: All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction

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Optolong L-Para 2" Dual-band Filter Dovetail Fully multi-coated lens elements: AllL 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 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