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AUTOSTAR CCD PHOTOMETRY 97

Attached on the inside corners of the bulkhead are four small

incandescent lamps with attached power wires. (Fig. H-3.) Small

pieces of white paper in the corners serve to block the light from

impinging directly upon the diffuser sheet, and help direct the light

upward, inside the box. The wiring for the four lamps is soldered

together and connected to a 9VDC battery, which is simply hung

on the outside of the box, and unplugged when not in use. No

voltage regulation is used.

Figure H-3. Inside of Plywood Bulkhead.

Wired Lamps Are Mounted in Four Corners,

with Light Baffles.

Flats taken with the light box have shown to be more consistent

than other methods, including “sky” flats taken during twilight.

(See Figures H-4 and H-5.) While these two flats look very

different, that is because of the contrast settings. Both flat field

images are actually very close, and work fine.

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Meade Image Processing Especificaciones Pagina 107