Astrodon LRGB Tru-Balance Gen2 E-series filter set - 1.25" (Pre-owned)

Astrodon Tru-Balance RGB filters have revolutionised astrophotography. Their popularity is based on their ease of use, high optical quality and great colour results when photographing galaxies, star clusters and nebulae. There are two versions of the Tru-Balance filters, namely the E-Serie and the I-Serie.

The E-Series red filter is a deep red filter about 60 nanometer wide, which excludes much of the light pollution from high pressure sodium street lamps. Other filter suppliers try to "force fit" their orange filter (designed for the interline KAI11000, KAI2000 sensors) for use with these full-frame sensors. Their orange filter is about twice as wide spectrally as Astrodon's deep red filter. As a result, their orange filter tends to "wash out" HII regions in galaxies and detail in nebula. Their blue and green color weights are no longer balanced and as a result, the OIII color in planetary nebula is skewed strongly toward blue, rather than the correct teal color. These are the reasons why Astrodon designed E- and I-Series filters for these different classes of cameras for optimum results.