QSI 520c Guía de usuario descargar pdf (Pagina 37)

QSI 500 SERIES USER GUIDE

Original image

Original image minus dark frame

Look at the two images above. The top image is the original image as it came out of the

camera. The bottom image has had the average of 5 dark frames subtracted from it. Note

that the bright pixels have been virtually eliminated leaving a smooth black sky background.

Flat Fields

Flat fields are used to correct for any irregularities in your optical system, such as vignetting

or dust motes, and to adjust for any pixel non-uniformity inherent in the CCD. Pixels in a

CCD all respond slightly differently to light, typically within 1% to 2% across a CCD.

All optical systems have a “signature” which gets recorded on the CCD. This unique

signature is caused by how light travels through the telescope illuminating the CCD and

how each pixel responds to that illumination.

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QSI 520c Guía de usuario Pagina 37