Optolong 3nm SHO Extra Narrow Band Filters
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Optolong 3nm SHO Extra Narrow Band Filters

£998.00✓ 2 year warranty
  






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6x in stock shipped 1-2 working days

About this product

Model:  optolong_sho_3nm_sho36

These NEW Optolong 3nm Narrow BAnd SHO astronomy filters are available at introductory prices from December 1st to 25th 2021.

The Optolong SHO - 3nm filter kit includes SII 3nm, H - Alpha 3nm, and OIII 3nm narrow band filters, optimised for use with modern astronomical monochrome cooled  CCD/CMOS cameras and modified DSLR cameras.

Each SII,Ha,OIII 3nm Filter is also available individually in 2" and 36mm sizes. Additional sizes will be available in the near future.

By imaging in each single channel mapped to the three RGB channels (SII, HA, OIII), astrophotographers can process Hubble palette images using popular astronomical post processing software.

The 3nm bandpass produces the highest contrast and reveals subtle details in nebulae that can be missed with broader band pass filters.

The Extra Narrowband SII 3nm filter is designed for imaging with 3nm bandwidth of light centred on a wavelength of 672nm and reduces the transmission of unwanted wavelengths of light, specifically those produced by artificial light including Mercury Vapour, and both High and Low pressure Sodium Vapour street lighting and the unwanted natural light caused by neutral Oxygen emission in our atmosphere (i.e. skyglow)

The  Extra Narrowband H - Alpha 3nm filter is a very popular narrowband filter with 3nm bandwidth of light centred on a wavelength of 656nm reducing the transmission of unwanted wavelengths of light, specifically those produced by artificial light including Mercury Vapour, and both High and Low pressure Sodium Vapour  Street Lighting and the unwanted natural light caused by neutral Oxygen emission in our atmosphere (i.e. skyglow)

Extra narrowband OIII - CCD 3nm filter is designed for imaging with  3nm bandwidth of light centred on a wavelength of 500nm which corresponds to the OIII emission line, and reduces the transmission of unwanted wavelengths of light, specifically those produced by artificial light including Mercury Vapour, and both High and Low pressure Sodium Vapour  street lighting and the unwanted natural light caused by neutral Oxygen emission in our atmosphere (i.e. skyglow). 

OIII emits at 495.9nm and 500.7nm and it is a blue - green coloured filter. Many images of planetary nebula and supernova remnants are taken with H - Alpha and OIIII filters only (Bi Colour). They show great structural details, but have more natural colours.

 

The OIII narrow band filter has frequently been a problem with the introduction of halos. Thanks to the experience Optolong have built up with their 7nm narrow band filter, the halo of the OIII 3nm filter was minimised by optimising the coating technology. Optolong also conducted a qualitative halo test using bright stars within the veil Nebula as can be seen from the image below.

 

 

 

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