Explore Scientific O-III 12nm 1.25 inch Filter

The Explore Scientific O-III 12nm 1.25" filter is a premium narrowband filter designed for astrophotography and visual observation of emission nebulae. It isolates the doubly ionized oxygen (O-III) spectral line at 501 nm with a 12 nm bandwidth, enhancing contrast and revealing faint details in objects like the Veil Nebula, Ring Nebula, and Orion Nebula.

Advantages

This filter provides exceptional contrast by blocking light pollution and other wavelengths, making it ideal for use in suburban or light-polluted skies. The 12 nm bandwidth ensures high transmission of the O-III line while minimizing background sky glow, resulting in sharper, more detailed views of planetary and diffuse nebulae.

Suitable for

• Visual observation of emission nebulae
• Astrophotography with monochrome or color cameras
• Use with telescopes of any focal ratio (f/4 to f/15)
• Enhancing contrast in light-polluted areas

Key specifications

• Filter type: O-III narrowband
• Bandwidth: 12 nm
• Central wavelength: 501 nm
• Filter size: 1.25" (31.75 mm)
• Threaded for standard 1.25" eyepieces and accessories
• Multi-coated for high transmission and durability

Recommendations

For best results, use with a telescope of at least 4" aperture and a dark-adapted eye. Combine with an H-beta filter for even more detail on certain nebulae. This filter is a must-have for any serious deep-sky observer.