DSO

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Most nebulae and galaxies require a very low power to preserve their misty contours, while open clusters, which are scattered over a relatively large area of sky, also demand a large field of view. Globular clusters , on the other hand, are small and condensed, and require a high magnification if any of their individual stars are to be made out. A powerful eyepiece destroys the contrast of wide double stars such as p Cygni by spreading the components too far apart, but Z, Aquarii and e Bootis can be divided only under a high power. Because of this, close double stars are an excellent test of the telescope's defining capacity, and it is possible to choose certain doubles as test objects for different apertures.

A collection of DSOs to view and browse, also includes videos and article links please do not edit this section