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Filtro Tecnosky SII 6,5nm 31mm non montato
Filtro Tecnosky SII 6,5nm 31mm non montato

Optolong Filters

31mm SII 6.5nm Filter Optolong

€169.00
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  • Codice SKU

    SII-31

  • Disponibilità

    1

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Descrizione

31mm SII 6.5nm Filter Optolong

This Filter is designed for nebula observation with 672nm wavelength. Reduces the transmission of certain wavelengths of light, particularly those produced by artificial lights, including mercury vapor, both high and low pressure sodium vapor lamps and unwanted natural light caused by the emission of neutral oxygen into our atmosphere (e.g. Skyglow).

Optolong_SII-CCD_6-5nm_large.jpg

Utilization and Performance

Narrow band imaging can be achieved by combining filters of the SHO set (H-ALPHA, OIII, SII), this will further help achieve a clear image even in heavy light pollution conditions.

The SII filter does not eliminate the effects of light pollution and does not increase the brightness of the object being shot, but rather increases the contrast between the nebula and the night sky, making image processing easier.

This Narrow-band 6.5nm SII Filter is designed to be attached to filter wheels, to filter drawers or, only for mounted filters, directly on DLSR cameras.

Technical Specifications

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
  • The SII filter has 80% transmission, the SII line is 672 nm
  • 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 minimize vignetting by maximize possible clear aperture (clear aperture is 26 mm for 1.25-inch; 45 mm for 2-inch)
  • Aerometal Material
  • Precise CNC Machining
  • Sand Blasting Process
  • Black Anodized Finish
  • Extinction Treatment to Prevent Reflection
  • Laser Engraving No Fading