List of products by brand Optolong

The Optolong L-eXtreme filter is a dual 7nm bandpass filter designed for astrophotography with one-shot color cameras such as DSLRs, as well as with monochrome CCD cameras. It is particularly well-suited for fast optical systems and offers an affordable solution for amateur astronomers who want to capture rich images of emission nebulae, even under bright, light-polluted skies.

The H-alpha filter is designed to pass light at the 656nm wavelength, making it an excellent choice for narrowband astrophotography. It is ideal for capturing high-contrast images and revealing intricate details within nebulae, even in locations affected by significant light pollution. The filter allows a narrow 7nm bandwidth centered on 656nm, effectively blocking unwanted wavelengths produced by artificial lighting such as mercury vapor and sodium vapor lamps, as well as natural skyglow caused by neutral oxygen emission in the atmosphere.