![]() Fortunately, the common ones can all be compensated when one uses a telescope.Īmong the most prevalent defects is astigmatism, which can be ameliorated with eyeglasses or by using only the small central area of our eye's pupil. Other defects vary from individual to individual. While our eyes are not perfectly color corrected, our brain processes out the errors. ![]() And this is without mentioning the wonder of stereo vision! Think about it: Our eyes have an automatic iris, automatic focus, an aspheric lens, a curved image surface, a chemical image intensifier, a windshield washer-wiper, and a lens cover, all as standard equipment. Eyesight: Glasses Off or On?Įyesight is an engineering marvel. Each segment of the journey plays a role in determining the telescope magnification range to use on a given night. This range is not fixed, however, and depends on the nature of eyesight, the telescope's aperture and optical design, atmospheric conditions, and even the type and size of the object looked at.Ĭonsider the complete viewing experience: starlight passes through the atmosphere, through the telescope, and finally into your eyes. ![]() How high or low can you get your telescope magnification? The answers depend on many factors that combine to give each telescope a useful magnification range. Illustration by Kevin Sartoris / Sky & Telescope These include the atmosphere, telescope optical system, and our eye - and telescope magnification can make all of the difference. The complete observing experience involves overcoming several impediments that lie between the starry heavens and the view we have of them.
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