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Astrodon Clear Filter with UV-Blocking Only - 1.25" Threaded Cell - C2-27R

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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 1.25" UV Blocked Clear Filter

This 1.25" round unmounted Clear filter blocks UV light, but unlike the Luminance filter, does not block NIR light. This filter provides 50% transmission at 395 nm (395 nm cut-on) while transmitting 97% or better to 1000 nm and is parfocal with all other Astrodon filters including LRGB and Narrowband filters.

Astrodon 1.25" Threaded Cell Clear Filter Highlights

  • Clear 1.25" threaded cell filter with UV blocking, but no NIR blocking
  • Provides 97% or more transmittance up to 1000 nm
  • 395 nm cut-on (50% transmission at 395 nm)
  • 3 +/-0.025 mm single 1/4 wave fused silica substrate before coating
  • 1/4-wave propagated wavefront before coating
  • Parfocal with all other Astrodon filters
  • Proudly manufactured in the USA