Question about Celestron Ultima 2000 -- 8 Telescope

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After alignmentment, scope points backwards

After aligning, any goto slew will take the scope to point to exactly the opposite direction. i could look down the optical tube through the eyepiece as a microscope i suppose. not surprisingly, it can't track either (i could live without goto).

i've tried dozens of times, all kinds of combinations including power cycling, removing/replacing the batteries, etc.

i do know how to align it - i've done it many times before. the only unusual thing is that this started to happen after i mistakingly left the tracking one night and the batteries ran out. ever since then, it points backwards.

anyone seen this before? any ideas?

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If you can RESET the hand controller do it-- then re-enter TIME, DATE, and SITE. Make sure you are in ALT AZ Mode and NOT Polar Mode if you do not have a wedge.

This is probably the issue-- you are in POLAR MODE by mistake.


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Posted on Jul 30, 2011

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1 Answer

Aligns to three known stars ok but then why does it go to completely wrong area and slews in slow speed?


Ha, a familiar problem with Synscan and similar. You must do these things exactly right. Set up the hand controller properly for
- time (daylight saving or not)
- location, lat and long.
- hemisphere N or S

The mount must be
-levelled (don't trust the bubble on the mount, they are rubbish)
-pointed at the celestial pole (if an EQ mount)
-pointed due S or N (if alt-az)

You will find that most of the time a 2-star alignment is sufficient. Attempting a 3-star alignment is usually only successful if you have also taught the controller about geometry errors in the mount itself (they all have such errors), which is a tedious procedure you ought to leave until later. Even a 1-star alignment may be enough for planetary and lunar obs.

Don't neglect to use the "sync to object" feature it probably has in the hand controller. To use this you slew to an object using a medium to low power EP, activate the sync feature, center the object in the EP, and press enter. This has the effect of fine tuning the pointing accuracy in that segment of the sky.

Apr 13, 2015 | Optics

1 Answer

Cannot see anything through my tlelescope


  1. Get Stellarium or another fine astronomy program
  2. During the day, point the telescope at a part of the landscape about 100 yards away.
  3. Use the lowest power eyepiece (highest number) in the focal tube.
  4. Center the landscape object in the telescope.
  5. Align the finder scope so that it points exactly where the main telescope is.
  6. At night, leave the scope out to reach thermal equilibrium (about an hour for small reflectors and refractors)
  7. If the scope is on a EQ mount, polar align.
  8. Point the finder at the moon. The moon should be in the main scope also.
  9. Practice finding the moon before you start on the planets
  10. Once you are comfortable with the moon and planets, you can go for the deep sky objects

Mar 24, 2015 | Optics

1 Answer

Telescope does not see anything


  1. Get Stellarium or another fine astronomy program
  2. During the day, point the telescope at a part of the landscape about 100 yards away.
  3. Use the lowest power eyepiece (highest number) in the focal tube.
  4. Center the landscape object in the telescope.
  5. Align the finder scope so that it points exactly where the main telescope is.
  6. At night, leave the scope out to reach thermal equilibrium (about an hour for small reflectors and refractors)
  7. If the scope is on a EQ mount, polar align.
  8. Point the finder at the moon. The moon should be in the main scope also.
  9. Practice finding the moon before you start on the planets
  10. Once you are comfortable with the moon and planets, you can go for the deep sky objects

Oct 12, 2012 | Optics

1 Answer

What am I doing wrong with my star alignment process? Please help.


I don't know your scope in detail, but if you can read this you should be able to go to the user manual here
http://www.bushnell.com/manuals/telescopes/NorthStar788840_788850_788890_788831_788846_2010Revised5LIM_web.pdf?CFID=36472283&CFTOKEN=de4b165f584ad635-AF7E3AEE-A567-68CB-F21AC262CDAFA920&

There are a few things common to these goto hand controls.
- you must enter the time and date accurately, and be correct about daylight saving settings, and observe the date format
- you most likely will have to go through time and date setting steps each time, but the control will probably remember one of these at least. You will see what it has already set when you come to that step next time around.
- the mount should be leveled as far as possible, or pointing errors will appear when the scope slews around.
It could be that the scope has no idea at all where the align star is, when using Earth Align. You are teaching it that, but if the rough location it tries to reach is way way off, it seems you need a second star and Align Star mode. Often with these devices you need one star from either side of the meridian.
You could also start again with a different city, but one in the opposite direction to the first. I would try cities all around the compass to see if one gives a better result.

Apr 08, 2012 | Bushnell NorthStar 78-8846 (675 x 114mm)...

1 Answer

While trying to do the initial alignment the telescope says slewing to Vega, but when it stops it is nowhere near Vega, Its almost 180 degrees out. some help would be very much appreciated The telescope is...


All GOTO scopes have specific setup procedures, usually:

1. Level the tripod

2. Point the scope NORTH or in the HOME position.

3. Center both alignment stars

etc etc

Read the manual and follow the instructions exactly.

Jan 11, 2011 | Tasco Optics

1 Answer

Meade LX200GPS The scope does not complete the 'Auto Alignment'


Once the scope has taken a GPS fix and knows TIME, and SITE, and you do a two star alignment your alignment stars overide any automatic alignment issues.

You could turn off the GPS put in Time, Date, and Site, do a two star alignment and everything would be fine. Centering the alignment stars is the "trick". Apparently the scope also finds NORTH OK, or the alignment stars would be way off. Since you pre-level the tripod already the software can FAIL on "tilt" and you still get good gotos.

I would not worry about it, especially since your gotos seem perfectly fine.

May 28, 2010 | Meade LX200GPS Telescope

1 Answer

Problem with Celestron Starseeker 100mm refractor


Could be several different mechanical or electronic issues with the scope.

From a dirty encoder disk inside to a bad motor clutch.

Best to return it to Celestron for repair.

Jul 01, 2009 | Orion Celestron StarSeeker 100mm GoTo...

1 Answer

GOTO ERRORS MEADE LX200 10" CLASSIC


Most problems tend to be mechanical. Have you 'trained' the drive and set the backlash values? Those 2 can have dramatic effects on pointing accuracy. Also, if the optical tube is not in alignment with the mount, then nothing will work correctly. To check that, have the telescope in Alt-Az configuration, inside the house, loosen the RA lock, and shine a laser pointer on the corrector plate. as the telescope is rotated about the RA, the reflected spot should be steady. Adjust the DEC to minimize the diameter of the circle that is drawn. What is left, is the out-of-true on the DEC axis. That can be adjusted with the tube cradle alignment bolts.

Oct 17, 2008 | Meade Optics

1 Answer

GoTo Problem


Be sure that the telescope is configured for EQ SOUTH mode to tell it is in the southern hemisphere. Once a star alignment is completed NEVER manually move the telescope. Use only the control panel to slew. Everytime the telescope is move by hand, the motors do not know it has been done, and assume it is still pointing at the old direction. Check the manual for setup.
Here: http://www.celestron.com/c3/images/files/downloads/NexStar_SLT_manual.pdf

Apr 06, 2008 | Celestron NexStar 130 SLT (306 x 130mm)...

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