Chroma Bessel UBVRI Filter Set U-Bessel: UV photometric filter in UVBRI seriesV-Bessel: Green (Visible) photometric filter in UVBRI seriesB-Bessel: Blue photometric filter in UVBRI seriesR-Bessel: Red photometric filter in UVBRI seriesI-Bessel: NIR photometric filter in UVBRI series Chroma Technology is an employee-owned company. They specialize in the design and manufacture of sputtered optical filters and coatings for applications that require the greatest precision in color separation, optical quality and signal purity. Their astronomical filters are used worldwide in research and amateur applications. They are as comfortable designing and manufacturing custom filters as they are for their catalog items. Highly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity. All filters may be used with apertures of f/4 or smaller. Chroma provides custom coating services for more demanding imaging applications requiring larger apertures such as f/3 or f/2. They also can provide larger sizes and unique passbands upon request. Chroma manufactures the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission. All filters are manufactured in Vermont. Additional Features: UBVRI filter set for photometric imaging Extremely durable coatings withstand humidity changes and extreme temperature fluxes and remain spectrally accurate in CWL and band pass adherence No reflections leading to image distortions or “back reflections” The Chroma Bessel UBVRI Filter Set is made for photometric imaging in five different bandpass. Technical Specifications Durable, anti-reflective coatings onboth exterior surfaces over applicable transmission rangeThickness: 4.9 +/-0.05mmParfocal +/-0.2mm In the Box Chroma Bessel UBVRI Filter Set of the chosen size Warranty & Manuals Chroma Astronomy Filters & Sets Brochure Lifetime Warranty for Sputtered Catalog Filters
