Baader Filters OIII CMOS f/3 Ultra-Highspeed 36mm (75579)

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.

Astrophotography greatly benefits from OIII filters, which are best used with monochrome cameras. For the best results, images captured using OIII filters should be combined with those taken using H-alpha and SII filters. This combination produces high-contrast images that clearly reveal faint nebulae.

Specifications:

    Central Wavelength (nm): 500.7
    Half-Value Width (nm): 4
    Frame Type: Ring
    Mount Material: Aluminium
    Coating: Reflex-Blocker™
    Filter Thickness (mm): 2
    Filter Size (mm): 36

Compatibility and Applications:

    Appropriate for f/ratio: f/3.4 - f/2.3
    Type: Line filter
    Series: f/3 Ultra-Highspeed

Applications:

    Useful for photographs: Yes
    Visually useful: No
    Nebulae & Galaxies: Yes
    Moon & Planets: No

These OIII filters are essential tools for astrophotographers aiming to isolate oxygen emissions and create high-contrast, detailed images of nebulae while minimizing interference from surrounding light sources.