Guide :Optics : ETX-90 (48x90 mm)

ETX-90 Focus My telescope was working properly before it was moved to Florida by a moving van. I can not now get the telescope to focus properly. I have tried adjusting the focus knob but no luck. I am also not sure if the eyepiece has been tampered with or not. Is there an illustration showing how the lenses should be placed in the eyepiece?

Posted by George Conquest on Nov 12, 2007

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Suggested Questions And Answer :


ETX-90 Focus My telescope was working properly before it was moved to Florida by a moving van. I can not now get the telescope to focus properly. I have tried adjusting the focus knob but no luck. I am also not sure if the eyepiece has been tampered with or not. Is there an illustration showing how the lenses should be placed in the eyepiece?


I suggest trying a different eyepiece first to see if that's the problem. Otherwise, if it was moved without adequate protection, there is a chance the mirror was shifted or damaged. A damaged mirror can't really be fixed since it's specs are very rigid. If it turns out to be a problem with the mirror the best thing to do is find an expert on telescope mirrors to try and fix the problem.
Read More At : ETX-90 (48x90 mm)...

I bought a skyquest xt10i telescope and am trying


A star is always just a point of light no matter what magnification you use! If you are seeing a "disk" when you focus on a star you are NOT focused! Make it a tiny dot.Why not try focusing on the moon or Mars and Saturn. You will always need to re=focus slightly when you move to another sky object.
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No matter what lens specification i install of the 3 that were supplid by meade, the object( any object.......the moon in this particular case) is never in focus. it is only ever in sharp focus when i move the eyepiece about an inch away from the telescope and hold it in my hand. not ideal i know, but the moon does then appear in very sharp focus. its as id the size of the eyepiece lens is too small. what to do. whats missing?


If possible turn the lens extension around. also there should be an adjustment you can make right on the eyepeice. turn it left or right
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Start Align with NexStar 4SE


Did you enter the correct TIME, DATE, and LOCATION? and yes you may have aligned on to the wrong stars -- they need to be "near" the center.
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Cannot focus a Meade Refractor "Electronic Digital" series


All of Meade's manuals are listed here--http://www.meade.com/manuals/index.htmlTake it outside during the day time-- put the eyepiece with the LARGEST number written on it into the telescope--- this is the LOWEST magnification.Point it at a distant object and practice focusing-- the moon should be your first night time object.
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Have been given a, "used" Edu Science 525x reflector telescope (set) in case. I,m looking for the following help .... 1) needs to be inspected,and overall cleaning done', and adjustments made to be sure it is all there, and working properly. .. 2) Also need to get, a user guide, and instruction book for it, if possible, so can operate it properly, that shows the different lens, and their operations, and how to assemble ,where they go. Can you help me find this information, or locate a place that i can contact to handle these things . THANK YOU


This is sold by Toys R US. You will not find a manual. It will NOT achieve 525x that is a complete lie. Maybe 100-150 power. Meade has manuals for all of their telescopes. Look under the REFLECTOR topic for one that is similar to your telescope. They all assemble the same way.Then read my TIPS on my profile page.Here is Meade's manual web site:http://www.meade.com/manuals/index.htmlFoe information on cleaning optics read this:http://www.televue.com/engine/page.asp?ID=143
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ETX 125 Loose image when focusing


The ETX family (and other Meade LX telescopes), use a moving mirror system for focus. The focus knob moves the main mirror in and out. For smooth operation, there is some slack on the central tube that allows the mirror to rock slightly as it moves. That is a normal condition, and the movement is magnified, the greater the magnification of the eyepiece.
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I have the Nexstar 8. It will not auto align or manual....


You must set TIME, DATE, and SITE-- probably does not know your actual location. Read the manual and perform all of the setup procedures. Some of these have a "starting position" again read the manual and make sure you are in the "home" position before you start the alignment. Read my TIP on my profile page about GOTO telescopes, and join the NEXSTAR forum on www.cloudynights.com
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I was given a Tasco Luminova a couple of months ago that had no eye piece in it, i have since purchased one for it thinking that this was the only thing that i needed for it to work correctly. Unfortu


Tasco telescopes are not worth owning. They will only frustrate you and you will dislike astronomy. Buy a Meade, Celestron or Orion Even the Celestron 70 travel scope, although it has a poor tripod, will give you a great view of the moon and ok view of Jupiter and Saturn They are under $80
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