Celestron CPC Series Manuale delle Istruzioni Scaricare il pdf (Pagina 35)

temperature layers have different densities and, therefore, bend light differently. Light rays from the same object arrive slightly

displaced creating an imperfect or smeared image. These atmospheric disturbances vary from time-to-time and place-to-place. The size

of the air parcels compared to your aperture determines the "seeing" quality. Under good seeing conditions, fine detail is visible on the

brighter planets like Jupiter and Mars, and stars are pinpoint images. Under poor seeing conditions, images are blurred and stars appear

as blobs.

The conditions described here apply to both visual and photographic observations.

Figure 7-1

Seeing conditions directly affect image quality. These drawings represent a point source (i.e., star)

under bad seeing conditions (left) to excellent conditions (right). Most often, seeing conditions

produce images that lie some where between these two extremes.

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Celestron CPC Series Manuale delle Istruzioni Pagina 35