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Astrodon Luminance Gen2 UV/NIR Blocking Filter - 49.7 mm Round Unmounted - L2-50R

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About Astrodon UV Blocking Filters

Astrodon filters are high performing, durable filters that provide significant aid for astrophotography and research pursuits. Each filter is constructed using a highly innovative process with a single high quality 3 mm thick fused silica substrate and full hard oxide sputtered coatings. Astrodon UV blocking filters come in two different varieties - a Luminance "L" filter that blocks both UV and NIR, and a Clear "C" filter that only blocks UV. The former is identical to the Luminance filter included with the both the E-Series and I-Series Astrodon LRGB filter sets. This filter provides at least 97% transmission between 400 nm and 700 nm, while the Clear filter provides at least 97% transmission up to 1000 nm.

Astrodon 49.7 mm Round Gen2 UV/NIR Blocked Luminance Filter

Included with Astrodon's E-Series as well as I-Series Tru-Balance LRGB filter sets, this 49.7 mm Generation 2 Luminance "L" Filter is parfocal with all Astrodon LRGB and Narrowband filters. Blocking both UV and NIR, this colorless filter offers 97% minimum transmission for 400 nm to 700 nm wavelengths. 50% transmission at 395 nm with blocking above 705 nm.

Astrodon 49.7 mm Gen2 Luminance Filter Specifications

  • Colorless 49.7 mm round unmounted UV/NIR blocking Luminance filter identical to the Luminance filter included with the 49.7 mm round I-Series and E-Series LRGB filter sets
  • Provides 97% or more transmittance between 400 and 700 nm
  • 395 nm cut-on (50% transmission at 395 nm); blocked above 705 nm
  • 3 +/-0.025 mm single 1/4 wave fused silica substrate before coating
  • 30 arcsecond parallelism
  • Approximately equal color combine weights for G2V white-point for both Full Frame (E) and Interline (I) detectors
  • Improved color separation (see transmission spectra)
  • Improved color rendition for color theory based galaxies
  • Virtually eliminates reflections and star halos
  • Features strong, ultra-hard edge-to-edge sputtered coatings
  • Proudly manufactured in the USA