Optolong L-eXtreme Filter

This filter is designed to pass light specifically at the Hydrogen-alpha (656.3nm) and Oxygen-III (500.7nm) wavelengths. By isolating these two lines, it effectively blocks most other wavelengths, including those from artificial light pollution.

Yes, you can use it with a DSLR or mirrorless camera, but it is most effective when paired with a dedicated monochrome or one-shot color astronomy camera. Note that because it is a dual-band filter, it will significantly restrict the light reaching your sensor, so you should expect to use longer exposure times.

No, this filter is specifically optimized for emission nebulae. Because galaxies and star clusters emit a broad spectrum of light rather than specific emission lines, this filter will block most of the signal you are trying to capture.

The 2-inch size is a standard format that fits most 2-inch telescope focusers, filter wheels, and drawers. Ensure your imaging train has the necessary clearance to accommodate the 1.85mm thickness of the glass.

Standard light pollution filters are often broadband, meaning they block specific wavelengths associated with streetlights while letting most other light through. The L-eXtreme is a narrow-band filter that blocks almost everything except the specific H-alpha and O-III signals, providing much higher contrast in light-polluted skies.