1. Optolong Clear Sky Filter Introduction
- A screw on filter with the easiest installation way like UV filter.
- Supress light pollution to make the night sky clearly.
- Enhance the contrast of images.
- To bring up the colors, fascinating experience.
2. Coating Technology
·Multi-layers anti-reflection coating
·Non-cementing optical substrate coating
·Optolong L-Pro 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.