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Optolong UBVRI Filter Set - 36mm Unmounted - UBVRI-36U

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This Optolong 36 mm UBVRI Filter Set has been discontinued and is no longer available. For a suitable alternative, here is our current selection of 36 mm filter kits. If we can be of assistance, please don't hesitate to call us at 1-800-266-9590 or send us an email, and we will be happy to help you. Thank you!

Optolong UBVRI Filter Set - 36mm Unmounted

This Optolong UBVRI filter set comes complete with five 36 mm unmounted filters. The five filters are the following:

  • Ultraviolet (U)
  • Blue (B)
  • Visual (V)
  • Red (R)
  • Infrared (I)

Made with multi-coated Schott B260 glass from Germany with an ion-assisted deposition technology, this filter set will maintain stability and scratch resistance on the central wavelength (CWL). The glass measures 3 mm thick. The filter substrate is fine-optically polished to 1.4 wave and <30 parallelism over both surfaces. The surface quality is 60/40 according to MIL-O-13830.

Each filter comes with a plastic case with high-pressure EVA case lining. The set is made to fit color filter wheels that accept 36 mm unmounted round filters.

About Optolong

Optolong is the Astronomy Filters division of Yulong Optics, an optical filter design, and processing company out of Kunming, China that has provided filters for over 700 optical companies since 1999. All Optolong filters pass European Union RoHS requirements and have been certified by TUV Rheinland and Bureau Veritas.