Baader Filters OIII CMOS f/3 Ultra-Highspeed 36mm (75579)
327.29 $
Tax included
OIII filters allow light with a wavelength of 501 nanometers to pass through, corresponding to the spectral lines of doubly ionized oxygen. These lines are emitted by planetary nebulae and some emission nebulae. By blocking all other wavelengths, these filters enhance contrast and make faint nebulae visible for the first time.