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Department stores and camera shops which do not know anything about telescopes, loudly proclaim their telescope's magnifying power. Magnification is the least important power of a telescope. Amateur and professional astronomers know that the light-gathering power and resolving power are the most important.
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www.astronomynotes.com/telescop/s6.htm
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Optical telescope - Wikipedia, the free encyclopedia
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An optical telescope is a telescope which is used to gather and focus light mainly from the visible part of the electromagnetic spectrum for directly viewing a magnified image for making a photograp...
en.wikipedia.org/wiki/Optical_telescope
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The light gathering power of a telescope is directly related to the area (or to the square of the diameter) of the main mirror or lens.
http://stargazing.suite101.com/article.cfm/astronomical...
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Reflecting telescopes tips refractors, light gathering power. ... Important information for telescope buyers! The larger a telescopes aperture (size) the more light gathering power and better resolution it has. There are billions of other objects in the sky, but they cannot be seen until a telescope is used.
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www.telescopes-astronomy.com.au/telescopes012.htm
www.telescopes-astronomy.com.au/telescopes012.htm
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observing deep sky objects such as faint galaxies and nebulae requires dark skies with excellent sky transparency and wide apertures of at least 8-10" as light-gathering power is especially important in determining the ability to see faint objects such as distant stars, nebulae & galaxies, ... telescope resolving power:
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www.ayton.id.au/gary/Science/Astronomy/Ast_Telescope.ht...
www.ayton.id.au/gary/Science/Astronomy/Ast_Telescope.htm
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Slide # 11: Telescope Terms ... the light gathering power depends on the collecting area of the objective ... 362 times more light gathering power!
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astro.gmu.edu/classes/a10594/notes/l11/l11.html
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Next: Resolving Power of a Telescope; ... Light Gathering Power (Page 101) (Problem 5-1); ... The larger the diameter of a telescope mirror, the more light it collects. Similarly, the larger the mirror, the less time it takes it to collect a given amount of light. This second relation can be expressed as:
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ceres.hsc.edu/homepages/classes/astronomy/fall97/Mathem...
ceres.hsc.edu/homepages/classes/astronomy/fall97/Mathematics/sec15.html
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Let's say you are an astronomer living on a planet orbiting Alpha Centauri, 4.3 light years away, and you want to build a telescope with which to study Earth at optical wavelengths. You want to be able to observe the planet Earth in fine detail.
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astron.berkeley.edu/~ay7/html/homework/hw8/node2.html
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Light Gathering Power Example: Human Eye vs. Hale Telescope ... Back to first slide ... View graphic version...
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physics.ucsd.edu/students/courses/winter2002/physics7/n...
physics.ucsd.edu/students/courses/winter2002/physics7/notes/lecture7/tsld011.htm
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