Baader Filters OIII CMOS f/2 Ultra-Highspeed 1.25" (70935)
850.88 ₪
Tax included
OIII filters allow only light with a wavelength of 501 nanometers to pass through. This corresponds to the spectral lines of doubly ionized oxygen, which are emitted by planetary nebulae and some emission nebulae. By blocking out all other light, these filters enhance contrast and make faint nebulae visible for the first time.