Jobert Telescope, 1878
The short-focus telescope invented by M. Leon Jobert, director of the Popular Observatory in Paris. The shorter a scope's focal length, the wider its field of view. For many of the deep-sky treasures (diffuse nebulas, open clusters, and big galaxies) a wide field is desirable to frame the whole object in surrounding starfield. Long focal lengths show a narrower patch of sky, which is ideal for viewing small objects like planets and lunar surface details. Short-focal-length optics introduce certain optical aberrations. Short refractors have more visible chromatic aberration than long refractors.
Size: 3088px × 4200px
Photo credit: © Photo Researchers / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1878, 19th, art, artwork, astronomical, astronomy, book, bw, century, deep-sky, drawing, field, france, french, historic, historical, history, illustration, invention, jobert, leon, observation, observatory, observing, optical, optics, paris, pdc, science, short-focus, technological, technology, telescope, wide
