BAADER BESSEL PHOTOMETRIC FILTER SET reducer Axes Azimuth: 85 mm diameter
USD609.50
USD641.50
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BAADER BESSEL PHOTOMETRIC FILTER SET reducer Axes Azimuth: 85 mm diameterThe Baader Bessel filters are precision grade photometric bandpass filters with transmissions according to the Bessel specification. The full set includes U, B, V, R & I filters and is available in 1. 25", 2", 36mm, 50. 4mm, 50 x 50mm, 65 x 65mm & 100 x 100mm sizes. The UBVRI system was developed in the 1950s for the 0. 9m McDonald Observatory telescope and initially consisted of a Johnson UBV filter set, later extended by Cousins to include the R and
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