Specifications

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.