BAADER BESSEL V PHOTOMETRIC FILTER Computerized 35 mm (105 mm with

35 mm (105 mm with optional reducer) Mount attachment CGE dovetail plate Threads 2"-24 UNC Tube length 432 mm Tube weight 6

Connection side A Sky-Watcher finderscopes Connection side B 1

are convenient to connect to most commercially available imaging-terminal and achieve perfect focus

This expedient allows to balance the exposure of each channel with the ratio of 1:1:1

BAADER BESSEL V PHOTOMETRIC FILTER Computerized 35 mm (105 mm withThe Baader Bessel V filter is a precision grade photometric bandpass filter with a central wavelength window between 500 700nm. 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