Celestron Advanced Series C5-S Manual do Utilizador descarregar pdf (Página 40)

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 6-1

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 Advanced Series C5-S Manual do Utilizador Página 40