OPTOLONG 2inch Filter Astronomy Telescope SII-CCD 6.5nm Narrow-Band Filter for Deep Sky
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Product details
| Management number | 208651269 | Release Date | 2026/03/22 | List Price | $79.60 | Model Number | 208651269 | ||
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1.The Optolong 2" Filters are made with Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. The filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted; black anodized, and then laser engraved. The result is a super thin filter cell that will produce a clear aperture of 26mm.
- Filter Manufacturing Processes and Parameters:
- 1.Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces
- 2.Surface quality, according to MIL-O-13830, is 60/40
- 3.80% transmission at SII line 672nm
- 4.Infrared wavelength 700-1100nm cut-off
- 5.0.1% transmission Hg at 435nm and 578nm
- 6.0.1% transmission Na at 589nm
- 7.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
- 8.Thin metal cells have a clear aperture of 26mm for 2" filters
- 9.Each filter comes with a plastic case with high pressure EVA case lining
| Item Weight | 1.44 ounces |
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| Manufacturer | OPTOLONG |
| Item model number | 045 |
| Product Dimensions | 2 x 2 x 0.04 inches |
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