Optolong L-Para 2" Dual-band Filter Adapter ·Optolong filter adopts precision coating

·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching

are safe glass solar filters that allows as much of the light through as possible through the telescope safely

The best solution of 55mm back focus length

4mm) diameter x 14

Optolong L-Para 2" Dual-band Filter Adapter ·Optolong filter adopts precision coatingL 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