BAADER BESSEL I PHOTOMETRIC FILTER GEOPTIK15 12 mm free aperture

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BAADER BESSEL I PHOTOMETRIC FILTER GEOPTIK15 12 mm free apertureThe Baader Bessel I filter is a precision grade photometric bandpass filter with a central wavelength window between 700 900nm. 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 I filters for the red region of the spectrum. The filters of the extended UBVRI system according to Johnson and Cousins include: U

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