Oxygen-III filters enhance the visibility of planetary nebulae by isolating the specific wavelength of light emitted by doubly ionized oxygen atoms within the nebula. By blocking other wavelengths, these filters increase contrast and reveal intricate details in the structure of planetary nebulae, such as shells, knots, and lobes, making them valuable tools for both visual observation and astrophotography of these celestial objects.
Come for the Scenery, Stay for the Stars