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OPTOLONG 1.25" 25nm O-III Filter Suitable for Visual Observations of Emission Nebulae, Planetary Nebulae
This Optolong OIII filter has a FWHM of 25nm, making it suitable for visual observations of most emission nebulae, planetary nebulae, and supernova remnants with a telescope of at least 6-8”. The OIII broadband filter increases the contrast between the background sky and these objects, so it will also help with observations of bright nebulae, such as the Great Orion Nebula, M42, from light polluted skies. Fainter objects require nights of good seeing and reasonably dark skies for best filter performance. This filter just might allow you to see objects that you'd otherwise miss.
Quality Filter Materials:
- 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
- Surface quality, according to MIL-O-13830, is 60/40
- 90% transmission at 495.9nm and 500.7nm
- 0.1% transmission Hg at 435nm and 578nm
- 0.1% transmission Na at 589nm
- 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
- Thin metal cells have a clear aperture of 26mm for 1.25" filters
- Each filter comes with a plastic case with high pressure EVA case lining
- 1.25" OPTOLONG O-III Filter
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- From AU Local Dispatch: AU:2-6 business days.
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On May-17-18 at 00:59:29 PDT, seller added the following information:
Filed under: Eyepieces & Accessories