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
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Mar 10, 2014 | Optics
Oct 01, 2013 | Kowa TSN-821
Jul 04, 2011 | Celestron AstroMaster 114EQ (100 x 114mm)...
Feb 22, 2011 | Bushnell 78-8845 telescope northstar 4.5"...
Jan 13, 2011 | Celestron NexStar 4 SE Telescope
Dec 26, 2010 | Optics
Aug 28, 2010 | Celestron NexStar 114GT (269 x 114mm)...
May 11, 2010 | Orion SkyQuest XT8 Dobsonian Telescope
Feb 23, 2017 | The Optics
813 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: