Astrodon Tru-Balance Generation 2 I-Series - LRGB Filter Set - 1.25" Round Mounted

  • Sale
  • Regular price $475.00
  • Astrodon Tru-Balance Generation 2 I-Series - LRGB Filter Set - 1.25" Round Mounted

    • Sale
    • Regular price $475.00
    • ITEM #



    Astrodon Tru-Balance Generation 2 I-Series - LRGB Filter Set - 1.25" Round Mounted

    Astrodon Tru-Balance Gen 2 - I-Series - LRGB 1.25" Mounted Filter Set

    Astrodon Tru-Balance RGB filters have revolutionized CCD imaging. Their popularity is due to ease-of-use, high optical throughput and great resulting color 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. This means that your RGB color combine weights will be approximately 1:1:1 within perhaps 10%. This can never be perfect, but it does allow you to take equal time exposures for your RGB data and also just one corresponding dark exposure time.

    This is the first change in Astrodon filter design and fabrication since their inception. Astrodon listened to your requests!

    Astrodon filters are parfocal on most systems. The new thickness tolerance of +/-0.025mm (25 microns) for Gen 2 LRGB fitlers is a factor of 2 better than Gen 1 filters, and should be parfocal for systems down to f/3.5, if your optical system is well color corrected. The Clear filter is likely a better choice for reflectors, such as Ritchey-Cretiens, rather than refractors or camera lenses.

    Halo elimination results from a pioneering design that places both the bandpass layer and the blocking layer on one side of the 1/4-wave substrate and a high performance anti-reflective coating on the other side. As a result there is virtually no internal reflection between these surfaces that can cause halos around bright stars in other filter brands. M45 is one of the most demanding of targets that often leads to halos around bright stars.

    Astrodon Tru-Balance Generation 2 Filter Features

    • RGB filters designed to produce true color for galaxies and stars based upon a G2V (sun-like star) white point.
    • Equal exposure time for each RGB filter leads to equal fluxes and equal color weights (combine ~ 1:1:1).
    • Correct blue-green color for OIII in plane-tary nebula with 1:1:1 RGB color weights for correct star color.
    • Two LRGB designs; E-Series for full-frame, and I-Series for Interline CCDs.
    • Deep red filter in E-Series brings out HII regions in galaxies and better definition of H-alpha in emission nebula.
    • All filters transmit an amazing 98% in their passbands for the highest perform-ance available.
    • All filters are UVƒ??????????? and NIR-blocked. No extra filters are needed.
    • Breakthrough design eliminates halos around bright stars.
    • Hardest optical coatings on 1/4-wave fused silica substrates for durability.
    • Coatings extend to the edge (no uncoated rims that need to be blocked) and no edge-sealing is required.
    • Light pollution suppression included in the design.
    Astrodon Product Number: LRGB2-I27R

    Additional Information

    Accessory TypeLRGB
    Filter MountedMounted
    Warranty5 Year Warranty

    Questions & Answers

    Ask a Question
    • Will these work well with Canon DSLR cameras (like the 100D or 700D)?

      Unfortunately, no. These filters are too small to fully illuminate an APS-C size DSLR sensor (24.5mm clear aperture, 28mm sensor diagonal). In addition, LRGB filters are only designed to be used on monochrome CCD cameras as color CCD cameras and DSLRs alr

    • Hi ! What type of case has this pair of binoculars , such as briefcase or a leather strap ?

      Thank you for your question. The binoculars come with a vinyl case which is very good for transport as well as a plastic strap & lens caps.

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