Chroma OIII 3nm Filters

The Chroma OIII 3nm Narrowband Filter is essential for imaging objects that are rich in ionized oxygen atoms. These filters work extremely well in heavy light polluted areas and allow you image on nights when the moon is up.

Chroma manufactures the highest quality astronomy filters with durable, sputtered hard coating using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.