AUTOSTAR CCD PHOTOMETRY 15

17. Repeat Steps 1 - 16 for each additional set of data points

desired (for a time sequence, for instance).

Note: Unless changed, the image files will be stored in a folder

called Meade Images. Find it and make a shortcut to it and put the

shortcut folder icon on the desktop for easy use later.

2.5.2 Flat Frames

Flat Frames/Fields provide a calibration for the pixels of the CCD

chip, and are used to remove defects (bad pixels), uneveness in the

chip response, and shadows from dust particles on the optics. Flat

Field images are taken just like regular star images; except the

telescope front end is evenly illuminated with white light. There

are several ways to do this. See Appendix G for information on the

suggested design and construction of a Light Box for taking Flat

fields. A simple light box seems to work best. One set of flat fields

(stacked/combined) must be obtained through each filter.

Sky Flats can be used if taken at the right time, just after or before

sunset/sunrise. Aim the telescope near the zenith and turn off the

clock drive (otherwise you may have star images even when the

sky is still fairly bright). Because the sky brightness changes

rapidly during twilight, sky flats must be taken as quickly as

possible. Dome Flats are a second method, pointing the telescope

at an evenly illuminated panel on the inside of the telescope

enclosure.

Take as many Flat Field images per filter as practical (10 to 100 is

ideal). The brightness of the illumination and/or exposure time

may need to be adjusted to get good flats. Adjust the exposure time

and/or brightness for at least 10,000 counts on the Histogram but

less than 65,000 counts (for each filter).

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 127 128

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