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38 AUTOSTAR CCD PHOTOMETRY

Figure A-4 shows the ATIK filter wheel disk with BVRI filters

installed in positions 1, 2, 3, and 4, respectively. Position 5 could

be used for a U filter, but because the CCD camera chip is

insensitive in that band, the Meade IR blocking (“Clear”) filter is

used, for deep sky imaging or “white light” photometry.

Figure A-4. Filter Wheel Disk with BVRI Photometric Filters.

Table A-1 lists the standard UBVRI Johnson-Cousins system filter

bandwidths, measured at the half-height point. Figure A-5 shows

the standard UBVRI filter passbands, plotted in Ångstroms. (10

Ångstroms = 1 nanometer.) Note: U band work is not practical

with most amateur CCDs and is only noted for reference here.

Table A-1. UBVRI Filter Bandwidths.

Band Center Width

367 nm 66 nm

436 nm 94 nm

545 nm 88 nm

638 nm 138 nm

797 nm 149 nm

Bandwidths measured at half-height point.

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Meade Image Processing Spezifikationen Seite 48