BAADER BESSEL PHOTOMETRIC FILTER SET reducer 25" diagonals which have a

SKU: 8420003575

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BAADER BESSEL PHOTOMETRIC FILTER SET reducer 25" diagonals which have aThe 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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