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...e seen by looking through a [[telescope]] with your eye and not by using [[CCD]] or film [[astrophotography]].

...re limits for the human eye at the telescope, modern image sensors such as CCD's can push a telescope 4-6 magnitudes fainter<ref name="birney"> </ref>.

..., Cambridge, p173</ref><ref name="howell1">Howell, S.B., 2010, Handbook of CCD Astronomy, 2nd ed. Cambridge University Press, Cambridge, p67</ref>. ...by the flat field image<ref name="howell2">Howell, S.B., 2010, Handbook of CCD Astronomy, 2nd ed. Cambridge University Press, Cambridge, p82</ref>.