Baader Filters OIII CMOS f/2 Ultra-Highspeed 50x50mm (70940)
278.12 £
Tax included
OIII filters are specialized tools that allow only light with a wavelength of 501 nanometers to pass through. This wavelength corresponds to the spectral lines of doubly ionized oxygen, which are emitted by planetary nebulae and some emission nebulae. By blocking out other wavelengths, the filter enhances contrast, making faint nebulae visible for the first time while suppressing surrounding light.