OSEELANG 1.25″ Filter H-Beta 25nm for Astronomy Telescope Horsehead/California Nebula Enhance Contrast Accessories OSL-241
Features:
1.CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture
2.Laser-engraved to prevent fading
3.Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition
4.Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces
5.High value transmission of pass-band and optical density of off-band is assured through Optolong’s planetary rotation system, a homogenous and precise coating procedure
6.Each filter comes with a plastic case with high pressure EVA case lining
7.Best used with a moderate to large aperture telescope and clear, dark skies
WARNING:
The filters are not designed for sun observation. DO NOT LOOK AT THE SUN WITH this FILTER. You would be BLIND if you fail to observe the warning.
Package Includes:
OSEELANG 1.25″ H-Beta Filter
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