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Imaging Filters


Frontier Optics Pricelist 


Optolong LRGB imaging filter set

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

  • 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



Optolong LRGB Imaging Filters

The LRGB filter set is designed for maximum contrast and with extremely high gradients for clear differentiation of colours. The LRGB filter set divides the spectrum into its components red, green, blue and luminance.

OIII emission overlaps on blue and green filters with maximum transmission to allow high efficiency and natural colour imaging. Gap between green and red filters serves to block out the primary Sodium light pollution line at 589nm and improves colour balance and separation.

Each filter set contains red, green and blue filters as well as a clear Luminance filter

Available format: 1.25" and 2"









Authorised Australian Dealers for:

AstroZap, Explore Scientific, Kokusai Kohki, iOptron, Lumicon, Optolong, Saxon, Telrad, Thousand Oaks, The Imaging Source, University Optics, William Optics