The Chroma H-Alpha 3nm Filter is essential for ultra high contrast images of nebulae under high levels of light pollution and Moon light. Normally used in comjunction with Chroma 3nm OIII and 3nm SII narrowband filters to create composite images.
Chroma Luminance Filter – New design to provide better images with modern sensors, especially when used with refractors.
Transmission between 420nm and 693nm is 96% to 99% and glass thickness is 3mm. Transmission data is from an actual filter and representative, but may vary very slightly between samples.