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AUTOSTAR CCD PHOTOMETRY 95

Plans and Further Details

Details of light box construction are shown in the photographs

following, and a suggested layout plan may be seen on the HPO

web pages. (URL: http://www.hposoft.com/Astro/astro.html ) A

web search on “CCD light box flats” will yield a number of

examples of light boxes successfully used in CCD imaging that

will be useful for photometry. The details of setting exposures in

each filter band, imaging flats, and using the flat field files for

calibration are given in other sections of this book.

HPO Light Box

The following photographs and description illustrates the

construction of a flat field light box in use at the Hopkins Phoenix

Observatory (HPO), installed on a 12 inch (30.5 cm) aperture

Meade LX200 GPS telescope.

Construction material was ordinary thick cardboard, cut and taped

into a simple box painted white on the inside to reflect and diffuse

the light, and black on the outside, to waterproof it against dew.

(Fig. H-1.)

Figure H-1. Interior Construction of HPO Light Box.

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Meade Image Processing Spezifikationen Seite 105