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Brand New OPTOLONG 1.25" 18nm O-III Filter for Telescope 1.25'' Eyepiece Hot!!!
OPTOLONG 1.25" 18nm O-III Filter for Telescope 1.25 inch Eyepiece Cuts Light Pollution
- Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces
- 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
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 OIII18nm Telescope filter
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 18-Sep-19 at 23:12:53 EDT, seller added the following information:
Filed under: Eyepieces & Accessories