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The L-Pro filter from Optolong is a multi-bandpass filter that works well for visual use as well as photographic use with CCD cameras and DSLR’s. Better color balance is achieved by maximizing the transmission band, allowing you to produce images of broadband emission objects with nominal color cast. Use the L-Pro filter alone to suppress infrared wavelengths when doing photography, or as a light pollution suppression filter when observing visually.
By reducing the transmission of artificial and natural light pollution, including neutral oxygen (skyglow) as well as light given off from mercury and sodium vapor lamps, the background sky will become darker, allowing the good stuff to shine through. High transmission of main nebulae emission lines at OIII, H-Beta, NII, H-alpha, and SII, when combined with the precision off-band blocking of contrast-killing light pollution, makes this filter perfect for most emission nebulae, reflection nebula, and dark nebulae.
The Optolong L-Pro Filter is made with Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. The filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved. The result is a super thin filter cell that will produce a clear aperture of 45mm.
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