Determining Field of View

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Accessories / Eyepieces & Barlows / How to pick an eyepieceDetermining Field of View
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Determining Field of View
   Good eyepieces and seeing
   Determining magnification
   Highest useful magnification
   Lowest useful magnification
   Exit pupils
   Middle age and the telescope
   Determining Field of View
   Eye relief
   Wearing eyeglasses
   Choosing eyepieces
   Eyepiece characteristics
Determining field of view: The actual field of view of an eyepiece roughly equals its apparent field (the angular diameter of the circle of light you see in the eyepiece when you look through it by itself) divided by the magnification provided by the telescope and eyepiece combination. For example, if a 50o apparent field eyepiece gives you 100x on a particular telescope, it will have a 1/2o actual field of view (50 ¸ 100) – about the diameter of the Moon.



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