Newton EQ-1 Instrucciones De Uso página 71

Calculating the field of view
Every eyepiece has a particular field of view, i.e. you are able to view a fixed angle of the sky. The size of this
angle depends on the focal length and the eyepiece design. Every eyepiece has an apparent field of view that
depends on its type of construction and aperture angle. The larger the apparent field of view, the larger the
angle which you can view. However, the field indicated on the eyepiece and the angle which you actually
observe are not the same thing. The true field of view depends on the focal length and the apparent field of
view of the eyepiece.
First calculate the magnification at your telescope and find the apparent field of view of the eyepiece.
True field of view: Apparent field of view / magnification
Example: 52°/90x magnification = 0.57°
Most object diameters in the sky are given in arc minutes or degrees. The moon has a diameter of half a degree.
Hence, in the example above, it would fill the entire field of view in the eyepiece.
Tip: Please bear in mind that it is worthwhile investing somewhat more funds for eyepieces on a long-term
basis. Good eyepieces keep their value. Even if you change your telescope the eyepieces you have can be
used further. These accessories are compatible with all models of telescope!
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