Astronomik Oxygen O-III Imaging Filter

The 6nm bandwidth is narrow enough to isolate the specific oxygen emission lines while blocking almost all other light, including light pollution. This results in significantly higher contrast for nebulae, allowing you to capture faint details that would otherwise be washed out by the sky background.

No, you shouldn't need to. This filter is parfocal with other filters in the Astronomik series, meaning it is designed to maintain the same focal point. You can swap filters during a session without having to recalibrate your focus.

Yes, it is designed to perform well with both CMOS and CCD imaging systems. Its high-precision optical glass and specialized coatings ensure it delivers sharp, high-resolution results regardless of your sensor type.

Yes, it is specifically engineered to block light from sodium and mercury vapor lamps, which are the most common culprits in urban and suburban light pollution. It also helps suppress natural airglow, making it a strong choice for imaging from less-than-ideal locations.

This is the standard thread size for 2-inch mounted filters. It ensures compatibility with most standard filter wheels, filter drawers, and eyepiece holders that accept 2-inch accessories.

The filter features an MFR coating that is extremely scratch-resistant and durable. It is designed to withstand regular handling and cleaning over the long term without degrading the optical performance.