Optolong 6.5nm SII Narrowband Deep Sky Imaging Filter

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Frequently bought with this product:

	Optolong SHO Narrowband Deep Sky Imaging Filters Add to Basket:----------Choose:  1.25" Mounted:  + £315.00Choose:  2" Mounted:  + £469.00Choose:  31mm Round Unmounted:  + £319.00Choose:  36mm Round Unmounted:  + £405.00
	Optolong LRGB Deep Sky Imaging Filters Add to Basket:----------Choose:  1.25" Mounted:  + £169.00Choose:  2" Mounted:  + £245.00Choose:  31mm Round Unmounted:  + £198.00Choose:  36mm Round Unmounted:  + £205.00
	Optolong 7nm Ha Narrowband Deep Sky Imaging Filter Add to Basket:----------Choose:  1.25" Mounted:  + £119.00Choose:  2" Mounted:  + £155.00Choose:  31mm Round Unmounted:  + £129.00Choose:  36mm Round Unmounted:  + £135.00Choose:  EOS-C:  + £139.00
	Optolong 6.5nm OIII Narrowband Deep Sky Imaging Filter Add to Basket:----------Choose:  1.25" Mounted:  + £109.00Choose:  2" Mounted:  + £169.00Choose:  31mm Round Unmounted:  + £130.00Choose:  36mm Round Unmounted:  + £135.00

About this product

Latest Version - Higher contrast and coating enhancements.

The Optolong SII 6.5nm filter allows 6.5nm bandwidth of light centered on a wavelength of 672nm through. This filter does an excellent job of blocking out other wavelengths of light specifically artificial sources of light pollution including mercury vapour, high and low pressure sodium vapour lights and unwanted natural light caused by neutral oxygen emission in our atmosphere (skyglow).

IMPORTANT: Filters manufactured by Optolong are NOT designed for observing or photographing the Sun. DO NOT use Optolong filters to observe or photograph the Sun. If you do it will result in permanent eye damage! 

Transmission Chart

Red Line: H-alpha, 7nm centred at 656.3nm.

Blue Line: SII, 6.5nm centred at 671.6nm.

Green Line: OIII, 6.5nm centred at 500.7nm

Technical Data

• Schott substrate material
• Thickness 2.0 mm
• Surface Quality: 60/40 (Refer to MIL-O-13830)
• Fine-optically polished to ensure accurate 1/4 wavefront and <30 seconds parallelism over the both surfaces
• 95% transmission at passband

• Infrared wavelength 700-1100nm cut-off

• Precision off-band blocking

Coating Parameter

• Multi-layers anti-reflection coating
• Non-cementing optical substrate coating
• Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change
• Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band

Filter Cell

• Ultra-thin filter cell minimise vignetting by maximise possible clear aperture (clear aperture is 26mm for 1.25”; 45mm for 2”)
• Aerometal Material | Precise CNC Machining | Sand Blasting Process | Black Anodised Finish | Extinction Treatment to Prevent Reflection | Laser Engraving No Fading

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