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SV132 1.25" Filters H-Beta 25nm Eyepieces for Horsehead Nebula in Dark Skies
- CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture Laser-engraved to prevent fading
- Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition
- Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces
- 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
- Each filter comes with a plastic case with high pressure EVA case lining
- 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.
Svbony focus on telescope and optical accessories. Aim to supply the high quality products and best service to customers. Main items are including Telescope, Monocular, Binocular, Spotting scope, filter, eyepiece and other accessories. We hope that you could enjoy a much more clorful life by using our products.
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On Feb-10-20 at 23:24:07 PST, seller added the following information:
Filed under: Eyepieces & Accessories