Clear Sky Filter
Use under 3-5 light hazards
Plastic box material
Box lining material
High pressure white EVA material
– Wide angle shooting of starry skies in all seasons in an environment with slight light pollution;
– The camera is capable of shooting city night scenes in light-polluted environments.
– High-precision double-sided polishing – ensuring substrate parallelism better than 30′ and face shape better than λ/4.
– Ultrasonic cleaning of pure water – using 13 tank cleaning process, effectively remove impurities and dust from the substrate surface.
– Ion source-assisted coating – optimizes film density, firmness and uniformity, effectively reducing temperature drift.
– Rigorous quality control – each filter is photometrically spectroscopically verified and laser interferometer type-checked.
1 * OPTOLONG 77mm Clear Sky Filter