Baader Filters OIII CMOS f/3 Ultra-Highspeed-Filter 31mm (75578)
273.43 $
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 other wavelengths, the filter enhances contrast and makes faint nebulae visible for the first time.