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Optolong L-Pro filter 2"
The L-Pro is a multi-bandpass broadband light-pollution filter that keeps natural colour balance. It suppresses the main artificial lines (Na 589 nm, Hg 435 and 578 nm) while staying highly transparent at H-beta, OIII, H-alpha, NII and SII, suiting galaxies, reflection nebulae and star clusters as well as visual use.
Specifications
Format
2" mounted
Type
Multi-bandpass broadband light-pollution filter
Spectrum
380–750 nm
Blocked lines
Na 589 nm; Hg 435 and 578 nm
High transmission
H-beta 486, OIII 496/500, NII 654/658, H-alpha 656, SII 672 nm
Material
Optical glass
Surface quality
60/40 (MIL-O-13830)
Transmitted wavefront
λ/4
Parallelism
<30"
Coating
Multi-layer anti-reflection coating on a non-cemented substrate, applied by ion-assisted deposition for durability and a stable centre wavelength with temperature.
Manufacturer documentation
Optolong L-Pro 2"
Compatibility notes Optolong L-Pro 2" mounted. Not the camera clip-in or 77/82 mm versions.
Additional specifications Spectrum 380–750 nm Blocked lines Na 589 nm; Hg 435 and 578 nm High transmission H-beta 486, OIII 496/500, NII 654/658, H-alpha 656, SII 672 nm
Riferimento
59435
Scheda tecnica
Formato
2" mounted
Materiale
Optical glass
Parallelismo
<30"
Qualità superficiale
60/40 (MIL-O-13830)
Fronte d'onda trasmesso
λ/4
Tipo
Multi-bandpass broadband light-pollution filter
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Optolong L-Pro filter 2" The L-Pro is a multi-bandpass broadband light-pollution filter that keeps natural colour balance. It suppresses the main artificial lines (Na 589 nm, Hg 435 and 578 nm) while staying highly transparent at H-beta, OIII, H-alpha, NII and SII, suiting galaxies, reflection nebulae and star clusters as well as visual use.
Manufacturer model: Optolong L-Pro 2" · Specifications checked against manufacturer data on 2026-11-03