Question about Celestron NexStar 5 SE (300 x 44.45mm) Telescope
I see a black spot in the eye piece when a viewing a star
If this is a Newtonian reflector or a catadioptric scope (Schmidt Cassegrain or Maksutov) you may be trying to use it at too low of a magnification. Your magnification needs to be high enough that the exit pupil is less than 5 mm; to figure this divide the focal length of the eyepiece by the f-ratio of the optical tube. If this quotient is 5 mm or more the black spot you are seeing is the shadow of the secondary mirror.
Posted on Jan 28, 2009
What type of telescope are you using?
Posted on Dec 14, 2008
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Posted on Jan 02, 2017
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