MODEL RELEASED. Amateur astronomy. Amateur astronomer uses a Newtonian reflector telescope in his own observatory dome. This telescope focuses light with a mirror which has a diameter of 45 centimetres. Reflecting telescopes are popular because,unlike telescopes with lenses,they do not cause colour distortions (chromatic aberration) in the observed light. It is also easier to make a mirror than a lens of the same size. Photograph of Robert Webb at Sky Ranch Ridge in the Carmel Valley,California,USA | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Young, Ed |
Taille de l’image : | 2581 px × 3764 px |
Model Release : | Disponible |
Property Release : | Non requis |
Restrictions : | - |