Question about Discovery Channel Meade 8" LX90-GPS Telescope with UHTC

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Lx90 I have just set up my meade lx90 and looking through the lens all I can see is black ball in the center that appears to be the secondary mirror surrounded by its baffle - I'm confused.  Help!

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Put a diagonal into the scope, and select the lowest power eyepiece you have-- that's the one with the largest number on it.

During the daytime practice focusing on a distant object-- then align your finder scope crosshairs to match what you see in the eyepiece.

Be sue to read the manual and learn how to enter, time, date, and site-- calibrate motors, and train drives--

Clear Skies

Posted on Dec 28, 2008

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The best thing I can suggest is to find a local astronomy club and have them help you.
To find a local astronomy club just go to the nearest Observatory or Planetarium and ask them where to find one.
Also you can go to WWW.ASTRONOMY.Com , click on COMMUNITY, and on the pulldown click on 'Astronomy Groups.'

Posted on Apr 10, 2008

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1 Answer

The bottom third of the picture is black


check to see that mirror goes all the way up

check to make sure secondary mirror attached to bottom of main mirror goes all the way up when mirror goes up

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for all of these set the camera on manual and bulb, and set it to fire without a card, and then take off the lens and look in the mirror box when firing

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I have an 8' meade telescope and cannot find my operating manual. Where may I find one for my old telescope?


This manual is located on the Meade web site here:

http://www.meade.com/manuals/index.html


and here is your manual:
http://www.meade.com/manuals/TelescopeManuals/LXseries/LX90-LNT.pdf

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2 small lens fell out of my telescope how do I get them back in and where do they go ??


The Meade ETX90 does NOT have small lens! It has a large curved lens in the front. and a holder for the eyepiece in the back (top). There is also a camera port in the back, and a flip lever that sends the light either straight back to a camera, or UP to the eyepiece holder.

There is an INTERNAL secondary mirror mounted on the back of the front large lens. If this fell off INSIDE, you will need to remove the front lens to fix it. NOT an easy fix as the optical alignment can get messed up when you do this.

Here is the manual for an ETX90, you should read it completely.

http://www.meade.com/manuals/TelescopeManuals/ETXtelescopes/ETX-90_105_125EC_man.pdf

and for the hand controller:
http://www.meade.com/support/etxautofaq.html

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1 Answer

Nothing seems to work on my LX90


You may need to purchase a new hand unit.
go to meade.com for purchase.

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I recently aquired the bottom part of a Meade Lightbridge 10" Truss Dobsonian Telescope. This includes the Primary Mirror & tube that contains it plus the 3 Struts and not much else. I think I can make...


Try posting this question on the www.cloudynights.com FORUM, either in the REFLECTORS topic, and or ATM, Optics Topic.

Someone will answer you with the exact dimensions You can also post a Free Classified ad there -- a WANTED ad looking for the entire missing top section, Meade "may" also be willing to sell you this.
www.meade.com.

Clear Skies

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The dec, knob must have streped on my 2000 LX90.


Look at this for a possible fix--

http://www.scopestuff.com/ss_ezck.htm

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I have a Meade telescope that is about 19 years old. I do not have the model#. The inside of the scope has a round silver & black circle that has dropped down so it is impossible to view anything.Can this...


Yes-- sounds like the secondary mirror-- fell off (inside).. This was originally attached to the back-side of the front corrector lens.

Here is an article about your problem---
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/3050186/Main/3049579

Expensive to have repaired--

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Loose dirt on mirror Meade Lx6


Nope, the dust is on the webcam sensor. The telescope mirror is too far away to influence the image. Most modified cameras have no window to keep dust off the sensor's cover. A camera lens cleaning brush works fine. Also, some cameras have 'hot pixels' that are defects in the sensor, and are permanent.

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Meade LX200R 12" Mirror Lock


The 'lock' is a ring gear that closes a ferrul against the draw tube to restrict its motion. It is not intended to be a hard lock. Try the Meade Advanced Users Group for further tips.
http://www.mapug-astronomy.net/

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2 Answers

Viewing planets and stars


The problem is you are way out of focus. Turn the focus knob alot, until the star image gets much much smaller. Keep going until it looks like a pin point or a star!. The spider vane and center black dot will disappear. This black dot is actually the secondary diagonal mirror reflection in the primary mirror. The peace signs are the secondary supports. Use the lowest power eye pieces. I would not use the Barlow lens that comes with this scope as it very poor quality. Also, using this high power with this small an aperature (tube diamter) & unstable mount will be very difficult indeed. Invest in some wide angle, long eye relief low power lens. Use these for a while before going to higher powers.

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