Guide :Optics : Deep Space 78-9518 (675 x 114mm) Telescope

Lost vision The telescope was working fine until I was trying to match the view through the smaller spotting scope with that of the main telescope, and suddenly I could faintly tell I was aimed at the moon by a soft glow alone, but could no longer actually see details nor the usual brightness of it. I've taken the scope apart and cleaned the lenses and mirror. I can see beautifully if I remove the eyepiece, but of course I'm just looking at the mirrors inside at that point. When I replace the eyepiece, all I can see is that very faint glow which, when focused, gives me that funky view of the inside of my own eyeball like when you get your eyes checked at the optometrist's office and they shine that bright light in your pupil. Any idea what's happened here and how I can fix it? Maybe I need a new eyepiece?

Posted by Venkie on Feb 24, 2008

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Lost vision The telescope was working fine until I was trying to match the view through the smaller spotting scope with that of the main telescope, and suddenly I could faintly tell I was aimed at the moon by a soft glow alone, but could no longer actually see details nor the usual brightness of it. I've taken the scope apart and cleaned the lenses and mirror. I can see beautifully if I remove the eyepiece, but of course I'm just looking at the mirrors inside at that point. When I replace the eyepiece, all I can see is that very faint glow which, when focused, gives me that funky view of the inside of my own eyeball like when you get your eyes checked at the optometrist's office and they shine that bright light in your pupil. Any idea what's happened here and how I can fix it? Maybe I need a new eyepiece?


Your telescope is a "Newtonian," as such it requires regular "collimation" Collimation the alignment of the optics. The mirrors must be lined up properly for the telescope to deliver a good image to the eyepiece. Your scope sound like it is way out of collimation. My guess is that the diagonal (secondary) mirror has rotated in it's mount. There are three basic tools for collimating a Newtonian the Sight Tube, Cheshire and Autocollimator. To get your digonal aligned correctly you need a sight tube. Rather than spend a lot on these consider making your own and keep an eye on eBay offerings. Don't bother investing in a laser collimator, they simply don't do the job unless you go for the very best. From some help with the collimation process check these links. http://www.astronexus.com/node/6http://www.amateurastronomy.com/collimate.html The 60 page pamphlet "New Perspectives on Newtonian Collimation," Fourth Edition by Vic Menard and Tippy D’Auria runs $10, but if you really want to do it right it's worth the money. HTH, George
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Scope eyepiece screw replacement.


Dear Tony, Please see properly at oject ring case or eyepiese plastic case.Their is a three screw.I thik one of this come out.
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Screw on Scope eyepiece fallen out.


Dear Tony Martin, I give you solution earlier. Thanks. Dhananjay Raval -India
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Problem with orion 6" dobsonian mount telescope


The small mirror is usually held on with double-sided foam tape. That tape us used, so the small mirror is not stressed by the metal fittings with temperature changes. Clean the residue from the holder and the mirror, and apply fresh double-sided mounting tape and carefully place the mirror so that the main mirror is viewed from the eyepiece position.
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I cant see anything. I don't see a hole for a battery am I missing something? I have a telescope with three cylinders attached and all three have eyepieces that I could look through. One of the cylinders has a rotating knob that makes the eyepiece go in and out, the cylinder sais "coated objects" dia =76mm and f=800mm, and right where I put my eye it sais f=4. I looked through all the holes while moving the movable eyepiece and still could see nothing.


Take the scope oput during the day tiome. DO NOT opoint it at the sun. Point it at a distant object like a telephone polem or a building. Look through the eyepiece with the largest NUMBER written on it-- and or the largest glass surface.Turn the knob until the object comes into focus.Read my tips on my profile page.
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Bought the edu science astro nova 102mm do you take the cap on the end by the finderscope completely off or just the middle? is there really a secondary mirror inside I can't see it?I am new at this I think I will like this scope but if you think it won't work could you recommend one for a beginner I want to look at the moon, planets,stars thanks jo


Take the cap completely OFF. You will see the secondary mirror holder, with the small mirror in t6he center pointed at the primary mirror in the bottom.Put the eyepiece with the largest number written on it into the telescope and take itn outside during the daytime. Practice focusing on a distant object.Go to the library or use the internet and Google "reflector telescope". Start reading about them.
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I have just bought an Astrolon telescope 288 power. I've assembled it following the instructions and I can't see anything. Inside the house I can pick few images but they appear upside down rather than laterally inverted as the instructions warn. This would be a minor problem if my child could at least spot a star through his brand new telescope, but it has been impossible to see anything except a blurred shadow. I tried watching a flying plane which was near and clear enough, but to no avail. An absolutely frustrating experience for my son who trusts Santa's efficiency!!! If the telescope is correctly assembled, what else could be the trouble? Thank you, Marta


All astronomical telescopes show upside down images --- it's normal.Stars are always points of light no matter what telescope you own. Download this star chart:www.skymaps.comObjects in the sky are tiny, smaller than the tip of your finger held at arm's length, try for the moon FIRST which is large. Then try Jupiter which is that very bright "star" to the Southeast after dark.Read my tips on my profile page.
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Carson JC-Skyseeker telescope


Practice focusing during the Day Time on a distant object-- use the eyepiece with the largest number written on it and do NOT use the 2x barlow if you have one-- just the eyepiece.Turn the focus knob until the distant object comes into focus. Objects in the night sky are TINY and your scope must be pointed right at them-- the moon which is a large target should be your first night time object.www.telescopeman.orgwww.telescopeman.uswww.telescopeman.info
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I have a broken elevation spindle, the little aluminum casting that passes through the plastic driven gear and ultimately ends in 4 tapped holes that the sleeve bolts to that holds the optical tube. We tried to repair this with JB Weld Epoxy, and it held for one night, but it broke again when moving the scope. Is a replacement spindle casting available from any source? Although I am an engineer, and if money were no object, I could probably reverse engineer this part, produce a blueprint from many careful measurements, go to a foundry, and have a new one cast (or drop forged) in stainless steel, it would cost many times more than the telescope itself, and for that price I could just get a much bigger scope with a far more rugged mount. The original damage happened when the motorized mount was in a duffel bag that someone knocked off the tailgate of a pickup. It fell about 3 feet and impacted on hard rocky terrain. Visually it appeared to be undamaged until the weight of the tube was applied, then it was obvious something had broken. I have some pictures of the part and exactly where it goes if it has a different name than what I described. So i need a good part number for this part, a valid address and price and delivery information to order one from. If someone has built an aftermarket one from something like stainless steel or similar stronger material, so much the better, as it might also stiffen the scope and reduce vibration and oscillation when one bumps the eyepiece while observing.


Meade "MAY" sell you the part? Usually they want you to send the scope back. Call customer service:http://www.meade.com/support/index.htmlThis is also a problem on the ETX model scopes. There are some ingenious fixes posted on the Mighty ETX web site.Here:http://www.weasner.com/etx/menu.html Bassically bolts, washers and nuts.Search the web site for Broken DEC knob.
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