Baader Filters OIII CMOS f/2 Highspeed 50x50mm
156.07 $
Tax included
OIII filters selectively pass light with a wavelength of 501 nanometers, corresponding to the spectrum lines of doubly ionized oxygen. These lines are emitted by planetary nebulae and some emission nebulae, allowing these objects to remain visible while other wavelengths are blocked by the filter. This enhances contrast, revealing faint nebulae that may not be visible otherwise.