The Optolong L-eXtreme is a dual-band, 7nm bandpass filter designed for astronomy imaging, specifically for capturing emission nebulae, planetary nebulae, and supernovae remnants. It is available in 1.25" and 2" mounted versions.

Dual-band filter with 7nm passbands centered on H-alpha (656nm) and OIII (501nm). Reduces light pollution and isolates emission lines for improved signal-to-noise ratio. Suitable for one-shot color cameras (DSLRs) and monochrome CCD cameras. More effective for fast systems due to its design.