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Image of M-45 the Pleiades taken with a simple achromatic or doublet refractor. Though visually stunning through the same telescope, the more sensitive sensors of a DSLR will quickly reveal that a doublet lens is not fully color corrected, giving the stars a multi-color psychedelic appearance. Adding an astronomical narrow band pass filter would have minimized that problem, but not fully. This is not a problem, however, with a true apochromatic triplet or quadruplet lens refractor, and any SCT, Newtonian reflector and quality camera lenses, where very little if any residual colors around such astronomical objects is evident.

Contributed by . . . Klaus Brasch



[ Example 2 would go here. ]








The following was retrieved from Wikipedia, the free encyclopedia, at en.wikipedia.org/wiki/Astrophotography

on February 28, 2016

Astrophotography

"Astrophotography is a specialized type of photography for recording images of astronomical objects and large areas of the night sky. The first photograph of an astronomical object (the Moon) was taken in 1840, but it was not until the late 19th century that advances in technology allowed for detailed stellar photography. Besides being able to record the details of extended objects such as the Moon, Sun, and planets, astrophotography has the ability to image objects invisible to the human eye such as dim stars, nebulae, and galaxies. This is done by long time exposure since both film and digital cameras can accumulate and sum light photons over these long periods of time. Photography revolutionized the field of professional astronomical research, with long time exposures recording hundreds of thousands of new stars and nebulae that were invisible to the human eye, leading to specialized and ever larger optical telescopes that were essentially big cameras designed to collect light to be recorded on film. Direct astrophotography had an early role in sky surveys and star classification but over time it has given way to more sophisticated equipment and techniques designed for specific fields of scientific research, with film (and later astronomical CCD cameras) becoming just one of many forms of sensor.

Astrophotography is a large sub-discipline in amateur astronomy where it is usually used to record aesthetically pleasing images, rather than for scientific research, with a whole range of equipment and techniques dedicated to the activity."

The license terms of this written work from Wikipedia may be found at http://creativecommons.org/licenses/by-sa/3.0/











Astrophotography on the CAS Website


Astrophotography on the Web






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