Astrodon

If you want the look of Hubble Space Telescope (HST) images, such as the famous “Pillars of Creation” (the Eagle Nebula, Messier 16), then the next filter to consider adding to your collection after H-a and OIII is the SII (es-two) or sulfur filter

The next filter to complement your LRGBH-a set is an oxygen filter. OIII (“ohthree”) emits light near 500 nm and is a blue-green- or teal-colored filter. Many of my images of planetary nebula and supernova remnants are taken only with H-a and OIII filters

It is not well known that most H-a filters pass both H-a and NII. H-a emits at 656.3 nm and NII emits most strongly at 658.4 nm (and weakly at 653.8 nm). These are very close together spectrally.

Astrodon 3 nm Narrowband Filters – H-α 3nm
H-α (hydrogen-alpha) at 656 nm (nanometers) is deep red in color and the most popular narrowband filter.

Astrodon LRGB Gen2 E-Series Tru-Balance Filter Sets have revolutionized CCD imaging. Their popularity is due to their ease-of-use, high optical throughput and great resulting colors for galaxies, star clusters and nebulae.

If you want the look of Hubble Space Telescope (HST) images, such as the famous “Pillars of Creation” (the Eagle Nebula, Messier 16), then the next filter to consider adding to your collection after H-a and OIII is the SII (es-two) or sulfur filter.

Astrodon Astrodon 5 nm Narrowband Filters – H-α 5nm

This Red Continuum filter (645 nm, 5 nm FWHM) produces a star map without the H-a or SII emission in order to subtract stars from emission images

Bring Out The Faint Structures In Nebulae

Astrodon Narrowband filters set a new bar of performance and durability for imaging and research.

Astrodon Clear Filters - Astrodon 1.25" Mounted Clear (UV-blocked, No NIR blocking)