The Optolong L-Pro (L-Professional) 1.25" filter is a multiband filter designed for visual observations and astrophotography of deep-sky objects in light-polluted conditions. Its optical design allows for selective suppression of wavelengths emitted by artificial light sources - including mercury vapor, low- and high-pressure sodium lamps, and natural sky glow - while maintaining high transmission in the important emission bands.

The filter transmits OIII (496 and 500 nm), H-beta (486 nm), NII (654 and 658 nm), H-alpha (656 nm) and SII (672 nm) lines with high efficiency, which translates into improved contrast and image detail. Thanks to its multiband transmission characteristics, it offers a much better color balance than classic UHC or CLS filters - which is especially important when photographing galaxies, clusters and reflection nebulae, where maintaining natural colors is crucial.

Optolong L-Pro 1.25" is suitable for observing and photographing wide-angle objects such as the Milky Way, delivering natural-looking images with significantly reduced influence of light pollution.

Key Features

• multiband filter for observations and astrophotography
• reduction of mercury, sodium and natural skyglow lamp emissions
• high transmission of OIII, Hβ, Hα, NII, SII lines
• perfect color balance – no noticeable color shifts
• proven in photography of galaxies and reflection nebulae
• high-quality anti-reflective coatings (AR coating)
• compatible with telescopes with a 1.25" filter

Technical parameters

• size: 1.25"
• type of frame: metal, threaded
• maximum transmission: >90%
• filter type: multiband (broadband, Anti-LP)
• spectral classification: band
• anti-reflective coatings: AR
• weight: 5 g
• use: visual and photographic
• observation objects: deep sky objects (DSO)
• warranty: 24 months