Question about Celestron NexStar 4 SE Telescope

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Mirrors When I look down into the mirrors I can see that a mirror has moved out of place and i'm not sure how to fix it or where to get it fixed.

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The primary mirror of the N4 is very securely held in place. The secondary is an aluminum coating on the back of the meniscus lens and can't move. I think what you are seeing is the secondary mirror's baffle tube becoming misaligned. This can happen if the scope is left in a hot automobile. Contact Celestron support for repair services.

Posted on Jun 27, 2008

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Telescope doesn't seem to work


This issue will be extremely hard to diagnose over the net but I'll give it a try. This is from Meade. The link to the online manual is below: http://www.meade.com/manuals/etx90ec/index.html Unable to see an image through the eyepiece:
  • Confirm that the lens cover has been removed from the telescope.
  • Confirm that the flip-mirror control (16, Fig. 1) is in the "up" position if using the eyepiece holder (4, Fig. 1) so that light is directed to the eyepiece (1, Fig. 1). Confirm that the flip-mirror control is in the "down" position if using the #932 Erecting Prism or doing photography with the ETX-90EC (see Telescope Controls and PHOTOGRAPHY WITH THE ETX-90EC).
It sounds like you are correct about a mechanical issue with the knob that moves the mirror. If you need a quick fix try your local camera repair or watch repair shop as the are familiar with intricate parts. The camera shop would be preferable as they know optics. Otherwise you could ship it to me and I could repair it fro you depending on the availibility of parts if parts were needed. Check my picture for my site address and get contact info there for more information.

Jan 05, 2008 | Telescopes

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While moving from NYC to Ft. Lauderdale, Fl, it seems that a lense was displaced inside my telescope. How can I fix this problem?


This telescope does NOT have a lens it has MIRRORS.

It also has eyepieces that slip into the focuser on the side of the tube.

Did you loose your eyepieces? or did the mirror fall out?

You can contact Bushnell customer service for parts and assistance:

Here:
http://www.opticsplanet.net/bushnell-warranty.html

and watch this video:

http://www.andysshotglass.com/Collimating.html




Aug 04, 2010 | Bushnell Deep Space 78-9003 (525 x 76mm)...

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The mirror in my telescope has broken loose


Not worth fixing a Bushnell telescope. The mirror is attached with CLIPS that tighten down on the edge of the mirror. Look at the bottom of the scope for the mirror clip bolts. DO NOT over tighten these. You should be able to stick a business card between the clip and the mirror. This is tight enough.

May 15, 2010 | Bushnell 675x5 EQ Reflector Telescope

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The mirror in my telescope has broken loose


I would open it up to see what I could see, you might be able to get lucky and epoxy it back in place, but I would think the alignment would be critical, so I'm not sure how difficult the task would be. If the mirror fits in a holder of some sort, and you're sure it will seat correctly upon gluing it, you might use a dab of JB Weld to hold it in place, it's the strongest epoxy I've found, and you'd only have to glue it once. Can't believe Bushnell wants $200 for the repair...might indicate a difficult job, or time-consuming, but you never know till you get in there and take a look. Good luck, hope you get it working!

Mar 30, 2010 | Bushnell 675x5 EQ Reflector Telescope

1 Answer

I need a mirror


You can have your current mirror re-silvered at several different places.

Here are two:
http://www.spectrum-coatings.com/index.htm

http://www.newportlab.com/

Jan 23, 2010 | Meade Starfinder Telescope

1 Answer

Turning the focus knob on my Meade LX50 Schmidt-Cassegrain Telescope does not change the focus; does not move the primary mirror. I need an exploded diagram and/or step by step instructions on how to...


The focuser has probably come loose from the "rod" on the mirror.

Here is the focuser disassemble instructions:
http://www.petealbrecht.com/Installing%20Digifocus.pdf

and this shows how to disassemble the main tube-
http://www.astromart.com/articles/article.asp?article_id=594

Jan 03, 2010 | Meade LX50 (8105003) (500 x 203mm)...

2 Answers

Primary reflector became dull with time.


The primary mirror is VERY delicate -- first surface mirror. Without a doubt you damaged it using auto polish. Mirror are cleaned very very gently using running water and alcohol-- and a tiny amount of dish soap... here is an article--
http://www.dvaa.org/ATM/MirrorCleaning.html

You can buy mirrors --- but they will be almost as expensive as a new telescope.

Jan 09, 2009 | Meade Polaris 114EQ-D (36 x 114mm)...

1 Answer

Flip mirror stuck


It is possible to repair but a major pain if you don't know the overall design.

Dec 25, 2008 | Meade ETX-80AT-TC Telescope

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Focus?


The C8 optical tube has a very large focal range. It should be capable of focusing on objects from 15' to infinity. To focus on object at infinity you have to move the primary mirror foward. You do this by rotating the focus knob CCW. Rotate the knob CCW until it comes toa stop them slowly bring the mirror back by rotating the knob CW while viewing the object. It will snap to focus so don't move too fast yor you'll miss it.

Jun 25, 2008 | Celestron NexStar 4 SE Telescope

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