Optolong L-Quad Filter 2-inch Filter Professional L-Quad Enhance Filter

Description: OPTOLONG L-Quad Enhance Filter (L-QEF) Quad Bandpass Light Pollution Suppression Filter 2" MountProduct description: L-QEF cuts out light pollution from mercury and sodium lamps and produces a nice broadband image with minimal colour cast. This filter is a broadband filter that suppresses light pollution wavelengths. It is good for star clusters, dark and reflection nebulae, and galaxies from light-polluted skies. Features： 1.Cuts out light pollution from mercury and sodium lamps and produces a nice broadband image with minimal colour cast; 2.Near IR cut-off to 1000nm, reducing the effects of IR noise; 3.L-QEF has more than 90% transmittance of the nebula emission lines at H-Beta/OIII/H-Alpha/SII, with cut-off depth from OD2 to OD4, thus providing a significant increase in resistance to light pollution. L-QEF is good for night sky from Bortel 1 to Bortel 7 levels; (Bortel 8, Bortel 9 environments shall not be recommended, kindly chose Optolong other narrow-band filters, 3nm, 7nm type of filters are available.); 4.Suitable for wide range of deep sky targets: it covers most nebulae, galaxies, star clusters, reflected and emitted line signals astronomical objects with higher contrast and rich details while maintaining excellent colour balance. L-QEF is superior to other filters of the same type. 5.Better suppression of starbursts; Higher contrast and more details of the celestial bodies; Better colour saturation; Better signal-to-noise ratio (SNR); Specifications: 1.Substrate: Optical Glass 2.Thickness: 1.85mm 3.FWHM: Quad Bandpass Filter 4.Blocking range: 300-1000nm 5.Blocking: OD2-OD4 6.Surface quality: 60/40 7.Transmitted Wavefront RMS: λ/4 8.Parallelism: 30" 9.Filter Size: 2" 10.Thread: M48*0.75 Package Includes: OPTOLONG 2" L-Quad Enhance Filter Sturdy Plastic Cases SpecificationsClear Aperture44mmFilter Type2" L-Quad Enhance FilterThickness2mmSurface Quality60/40Size2inch(50.8mm)Model NumberOptolong L-Quad EnhanceTypeMonocularOriginMainland ChinaBrand NameOptolongAstronomy L-Quad Enhance Filterfor monocularoptolong 2" L-Quad Enhance Filterfor EyepieceOptical L-Quad Enhance Filteroptolong L-Quad Enhance Filter 2 inchL-Quad Enhance Filter CCD/DSLR Deep Skyoptolong L-Quad Enhance filter for Astronomy Telescopeoptolong filter 2" L-Quad Enhance FilterFilter AstronomicalOPTOLONG 2" L-Quad Enhance Filterfor Binoculars monocularfilter optolong 2" L-Quad Enhance FilterAstronomy photography & observationlight pollution filterOPTOLONG L-Quad Enhance Filteroptolong L-Quad Enhance filtro optolongoptolong L-Quad Enhance Filter Astronomicaltelescope eyepiece L-Quad Enhance filtersfor Telescope telescopio

Price: 189 USD

Location: zhejiang

End Time: 2025-01-03T02:00:47.000Z

Shipping Cost: 5 USD