Chroma

Superior quality Chroma LRGB filteset available in either 1.25" mounted or 31mm unmounted.

H-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen.

OIII 3nm Narrow Band filters isolate the doublet emission of doubly ionized Oxygen. After ionized hydrogen, this is the next most common emission when imaging nebulae.

SII filters isolate the emission from ionized Sulfur atoms, also common in nebulae. Emission is at two lines occurring as a doublet, at 671.6 and 673.1 nm.