OPTOLONG 1.25\" 18nm O-III Filter for Telescope Eyepiece Cuts Light Pollution For Sale
![OPTOLONG 1.25\](telescope-image-large/g/gl4AAOSw5P9d0fZp/s-l1600/OPTOLONG-1-25-18nm-O-III-Filter-for-Telescope-Eyep.jpg "OPTOLONG 1.25\")
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OPTOLONG 1.25\" 18nm O-III Filter for Telescope Eyepiece Cuts Light Pollution:
$78.00
OPTOLONG 1.25" 18nm O-III Filter for Telescope 1.25 inch Eyepiece Cuts Light Pollution Feature: Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfacesSurface quality, according to MIL-O-13830, is 60/4090% transmission at 495.9nm and 500.7nm0.1% transmission Hg at 435nm and 578nm0.1% transmission Na at 589nmHigh value transmission of pass-band and optical density of off-band is assured through Optolong’s planetary rotation system, a homogenous and precise coating procedureThin metal cells have a clear aperture of 26mm for 1.25" filtersEach filter comes with a plastic case with high pressure EVA case liningPackage Includes:
- 1.25" OPTOLONG OIII 18nm Telescope filter
