Optolong Neutral Density ND3 Filter 2 Mounted for Observe Venus Moon

1This ND30 Neutral Density Filter from Optolong can be used with a solar wedge or on an eyepiece to cut the overall brightness of an object without changing the color balance Since all wavelengths of light are transmitted uniformly neutral density filters retain an objects true color Use this ND3 filter to split double stars observe Venus or experience a more detailed view of the Moon 2The Optolong Neutral Density Filter has an ND30 rating and so it has a 1000 reduction factor and a transmission of 01 3The Optolong Neutral Density ND3 Filter is made with Schott glass that has been multicoated with an ionassisted 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 sandblasted black anodized and then laser engraved The result is a super thin filter cell that will produce a clear aperture of 44mm 4B260 substrate material from Germany 20mm thick 5CNC machined and black anodized aerometal filter cell that is ultrathin to provide largest clear aperture Laserengraved to prevent fading 6Multiple layers of antireflection noncementing coatings applied via electronbeam gun evaporation with Ionassisted deposition 7Filter substrate is fineoptically polished to 14 wave and 30 parallelism over both surfaces 8Surface quality according to MILO13830 is 6040 91000 reduction factor 01 transmission 10Optolong planetary rotation system is a homogenous and precise coating procedure 11Each filter comes with a plastic case with high pressure EVA case lining