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Astrodon

LRGB I-Series Filters


  • 47500

This item is out of stock but you can place an order now and we’ll ship when it becomes available.


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Our Take

Astrodon I-Series LRGB filters are some of the best on the market.  Designed for Kodak's interline sensors, these filters will generate a nearly 1:1:1 color balance on those detectors. The build quality of the filters, combined with their significant reflection and star halo reduction make these filters our preferred choice for CCD imaging filters.

Astrodon Tru-Balance RGB filters have revolutionized CCD imaging. Their popularity is due to ease-of-use, high optical throughput and great resulting colors for galaxies, star clusters and nebulae.  There are two varieties of Tru-Balance filters - E-Series and I-Series.

I-Series filters are designed to approximately equalize the flux of Kodak's Interline CCD detectors, including compensation for the solar photon flux.  The I-Series filters compensate for the lower red response of these Interline detectors affecting the design of the Green and Red filters.  The Luminance and Blue filters are the same as those in our E-Series.  This means that your RGB color combine weights will be approximately 1:1:1 within perhaps 10% for equal length exposures.  This can never be perfect, but it does allow you to take one exposure time for all of your RGB data and therefore, only just one corresponding dark exposure time.  Again, this saves you precious imaging time and thus, simplifies your imaging.

  • Set includes Luminance (NIR/UV-blocked colorless), Red, Green and Blue filters
  • 1.25" mounted, 31, 49.7 mm dia.
  •  3 +/-0.025 mm single 1/4 wave fused silica substrate before coating 
  • 30 arcsec parallelism
  •  ~1:1:1 color combine weights for G2V white-point for Kodak Interline detectors
  • Equal RGB exposures and one dark time
  • Better color separation (see spectra)
  • Better color rendition for galaxies based upon color theory
  • Significant reflection and star halo reduction 
  • Spectral "gap" between green and red filters to reduce the effects of light pollution
  • Highest efficiency blue filter with less UV
  • Correct "teal" OIII color for planetary nebula (OIII signal >97% in blue and green)
  • Parfocal with Astrodon's high-performance narrowband and near-IR luminance filters
  • Ultra-hard and durable sputtered coatings coated to the edge of each filter
  • Proudly made in the U.S.A.

 


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