Astronomik H-Alpha Imaging Filter

The 12nm bandpass acts like a precise gatekeeper, allowing only the specific light emitted by hydrogen-alpha gas to pass through while blocking almost everything else. This dramatically increases the contrast of nebulae against the night sky, making them pop even if you are shooting from a location with significant light pollution.

No, you do not. Because this filter is parfocal with others in the Astronomik series, it shares the same optical thickness, meaning your focus point remains consistent when you swap filters during a session.

Yes, this filter is designed to be compatible with optics up to f/3. It maintains high performance and transmission levels even with faster focal ratios, which is critical for wide-field astrophotography.

The filter features a specialized coating that is both moisture and scratch-resistant. It is built to withstand the rigors of outdoor use, ensuring the surface remains clean and effective over many years of imaging.

Yes, it is designed to block unwanted UV and IR light. This ensures that only the intended H-Alpha wavelengths reach your sensor, preventing unwanted artifacts and keeping your deep-sky images sharp and clear.