OIII filter 7nm Prime - 36mm (unmounted)

Antlia OIII 7nm Prime filter

Capture the faintest deep-sky OIII emissions with precision thanks to the Antlia OIII 7nm Prime filter. Designed for high-speed lenses up to f/2, this filter guarantees maximum contrast and optimum signal to reveal the faintest nebulae.

Key features

• High transmission (>90% at 500.7nm) to maximize the OIII emission signal.
• Bandwidth 7nm ideal for combining performance and compatibility with fast optics.
• OD4 deletion out-of-band for a better signal-to-noise ratio.
• Can be used up to f/2 with no significant loss of performance, ideal for fast instruments.
• One-piece design effectively limiting internal reflections and stellar halos.

Ideal applications

• Imaging OIII nebulae
• Observation of planetary nebulae and Wolf-Rayet
• Photograph of supernova remnants
• Use in light-polluted or deep-sky areas

Technical specifications

Available formats

• Unmounted: Ø36mm

Design and reliability

• Surface treated to reduce scratching
• Blackened edges to eliminate internal reflections
• Spectral profile with sharp cut-off to limit halos around bright stars

Safety warning

Warning: never look directly at the Sun with this filter. This can lead to serious, irreversible eye damage.