Manufacturer: Optolong
Product number: OPL-SII6-2

EUR 229,00RRP EUR 250,00you save 8.4% (EUR 21,00)


incl. 19 % VAT (DE)  
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  • On stock
  • Only 2 pcs left in stock





rating: 5.0 of 5
  • Details..
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Optolong S-II Deep-Sky Filter 6.5 nm, 2" Filter Cell
Extra Narrowband SII 6.5 nm filter is designed for nebula observation allowing 6.5 nm bandwidth of light centered on a wavelength of 672 nm through, which corresponds to the [S II] emission line, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (skyglow).

Main Use and Performance
Suitable for photographing on faint emission nebulae in full moonlight or in severe light pollution
Hubble look of images can be made by the combination of H-alpha, OIII and SII, such as the famous “Pillars of Creation” (M16 Eagle Nebula)
Narrowband imaging with SHO set (H-alpha, OIII and SII) can be done with the moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks

Substrate:High-quality optical glass from Schott
Thickness:2.0 mm
Surface Treatment:Fine-optically polished
Surface Polish Quality:60/40 (Refer to MIL-O-13830)
Surface Quality:1/4 wavefront
Coating:Muti-coated
Cell:Filter cell 2", black anodized, laser engraved
Clear Aperture:45 mm
Cell height:5 mm without external thread, 7 mm with M48 external thread
Typical transmission off-band:0.1% (OD3)
Centre wavelength [S II]:672 nm
FWHM [S II]:6.5 nm
Typical transmission [S II]:80%
Filter
Protective case

Which side of the filter needs to face towards the telescope?
Optolong has a good explanation on their page with a check on unmounted filters. With mounted filters, it´s easy. The side with the external thread must face the camera.

Link to iOptron page: Should Optolong filters be installed in a certain orientation? (external link)
You can download the generated PDF from our own server.


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Reviews

Written by Wouter Cazaux
on 2021-08-12

"Quality product"

Written by Burkhard Wallesch
on 2020-04-21

"Gut verarbeiteter Filter"