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194518 2" OPTOLONG 6.5NM SII DEEP SKY IMAGING FILTER

$344.95
SKU:
194518
Weight:
0.5000 LBS
Shipping:
Calculated at checkout
Quantity:

Product Description

OPTOLONG 2" SII-CCD 6.5nm Deep Sky Imaging Filter

The narrowband SII-CCD 6.5nm filter (Sulful II for CCD) is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapour, and both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

Main Use and Performance

  • Use with H-alpha and OIII-CCD extra narrowband filters (SHO Set) for tricolor CCD astrophotography
  • Narrowband imaging with SHO set can be done with the moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks
  • Images such as the famous “Pillars of Creation” (M16 Eagle Nebula) can be made by the combination of H-alpha, OIII-CCD and SII-CCD filters. 
  • Narrowband filters do not eliminate the effects of light pollution nor increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, but not by brightening the nebula.
  • WARNING: Optolong filters are not designed for solar observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTERS.  

Technical Data

  • Schott substrate material
  • Thickness 2.0mm
  • 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
  • 80% transmission at SII line 672nm
  • Infrared wavelength 700-1100nm cut-off
  • 0.1% transmission of off-band, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm). Transmission of 0.1% is equivalent to OD3(Optical Density), and a high optical density value indicates very low transmission, and low optical density indicates high transmission.

Coating Parameter

  • 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 26mm for 1.25”; 45mm for 2”)
  • Aerometal Material | Precise CNC Machining | Sand Blasting Process | Black Anodized Finish | Extinction Treatment to Prevent Reflection | Laser Engraving No Fading

Package

  • Plastic PP Case | Imported High Pressure EVA Case Lining | Silver Cardboard Box | High Density Sponge Carton Lining

Size

  • Standard 1.25” & 2” | Round 36mm Unmounted

Spectral Curve

SII CCD 6.5nm


ADDITIONAL OPTOLONG ASTRONOMY FILTERS 

Broadband Filter   Bandpass Photo Filter   Other Photo Filter
CLS
CLS-CCD
UHC
O-III 25nm
H-Beta 12nm
L-Pro
Venus-U
SII-CCD 6.5nm
OIII-CCD 6.5nm
H-Alpha 12nm
SⅡ-CCD 12nm
OIII-CCD 12nm
H-Alpha 7nm
IR Pass 685nm
Night Sky H-Alpha
Moon&Sky glow
Clear Focusing
UV/IR Cut
LRGB

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