SVBONY 2" SII-CCD Telescope Filter Narrow-Band 7nm for Deep Sky photography

Description

The Sulfur II 7nm Extra Narrowband Filter transmits a 7nm bandwidth of light that is centered at 672nm and drastically reduces other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural). Like all Svbony filters that are designated as “CCD”, this SII filter also blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter.
Quality Filter Materials:
Material from Germany, 2.0mm thick
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 Manufacturing Processes and Parameters
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
80% transmission at SII line 672nm
Infrared wavelength 700-1100nm cut-off
0.1% transmission Hg at 435nm and 578nm
0.1% transmission Na at 589nm
Thin metal cells have a clear aperture of 45mm for 2inch filters
Each filter comes with a plastic case with high pressure EVA case lining
Package Includes:
SVBONY 2" SII 7nm Filter
Sturdy Plastic Cases
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