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Astrodon UVenus Filters

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Astrodon introduces a breakthrough in UV filters for CCD imaging. A durable, hard--coated UV filter of the highest quality having the best transmission available.


  • 1.25" mounted and 49.7 mm diameter unmounted
  • 3.000+/-0.025 mm substrate thickness
  • Single, striae-free fused silica substrate
  • 1/4 wave substrate prior to coating
  • < 0.5 arcminute parallelism before coating
  • Hard coated to edge
  • Guaranteed to > 90%T peak transmission (>94% typical)
  • <0.01%T 285-305 nm; <0.1%T 420 - 1100 nm
  • Image Venus during daylight due to elimination of all visible light
  • Proudly made in the U.S.A.



This filter is NOT to be used for visual observations, specifically the sun or UV light sources.