Meade Image Processing Manual do Utilizador descarregar pdf (Página 4)

images), it is black and white (which increases sensitivity to faint light), it is stable and

linear (so it does not lose electrons during exposure time as a regular camera would), and in

is general of better quality (fewer defective pixels). All these together make astronomical

CCD’s more expensive, and their use more complicated. The payoff is obtaining

spectacular images that cannot be made any other way.

Color pictures are made with a computer from three components, each taken separately

with a color filter, red, green and blue (the RGB technique). These filters are built in into

the camera on a filter wheel.

By now all telescopes in optical astronomy are equipped with CCD’s for detecting light.

They are used for simple picture taking, for measuring the brightness and color of stars, for

registering spectra of stars and galaxies. They are so much superior to all other ways to

detect and record light, from the human eye to photography, that we cannot understand any

of the modern astronomical techniques without experience with CCD’s.

Fig. 3. A filter wheel

Fig. 2. A CCD chip

1 2 3 4 5 6 7 8 9 ... 28 29

Sem comentários

Meade Image Processing Manual do Utilizador Página 4