Filters Pro Veil SII 3nm 2''

SII filters: The narrow-band filter allows light from ionised sulphur atoms at 650 nanometres to pass through. This is the line in which many planetary nebulae, emission nebulae and supernova remnants shine.

Astrophotography: Monochromatic cameras are best used. Ideally, combine shots with SII, OIII and H-alpha filters. This results in an image that shows the delicate nebula structures in high contrast and clearly.