Baader Filters OIII CMOS f/2 Ultra-Highspeed 50.4mm (70939)
400.83 $
Tax included
OIII filters are designed to transmit only light with a wavelength of 501 nanometers, which corresponds to the spectral lines of doubly ionized oxygen. These specific lines are emitted by planetary nebulae and some emission nebulae. By blocking out other wavelengths, these filters make these objects visible while increasing contrast, allowing faint nebulae to be observed for the first time.