When I inserted the Erecting lens into the focusing tube, then the penta mirror into the Erecting lens, I place the 12.5 eye piece on the penta mirror and I'm not able to see anything, it looks dark, what can I do?, the same happens when I tried to use the Barlow lens. Thank you for any help.
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Re: upside down images
ALL astronomical telescopes show upside down images it is normal. Put the eyepiece with the LARGEST number written on it into the diagonal. Do NOT use the 2x barlow it is too much magnification for that small aperture telescope.
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All astronomical telescopes have upside down images -- there is no up or down in outer space. This is probably a REFECTOR style telescope. The part with the small mirror is called a diagonal. Certain types of diagonals called "erecting diagonal" can be used to flip the image right side up for terrestrial viewing. You do not need them for star gazing.
All astronomical telescopes show upside down images. It's completely normal. Nothing is wrong with the scope. For terrestril viewing you can buy an "erecting prism diagonal" which will turn the images right side up.
Like this: http://www.skiesunlimited.net/index.php?CategoryID=98
No no manuals. The smaller the number written on the eyepiece the GREATER the magnification.
However many astronomical telescopes show everything upside down. This is normal -- no up or down in space. You can buy and erecting prism diagonal for terrestrial viewing which will turn the image right side up.
Here is the manual-- read it cover to cover-- http://www.meade.com/manuals/TelescopeManuals/ETXtelescopes/ETX-90%20w-autostar%20man.pdf
1. Take off the lens cap
2. Put your lowest magnification eyepiece into the telescope on the TOP eyepiece port-- there is a lever on the side which rotates the diagonal mirror between the top and rear ports --- can you see light through the telescope? If not turn the lever.
3. During the day practice focusing on a distant object at least 100 yards away-- the image will be upside down -- this is not a problem-- no UP or Down in space.!
4. The lowest magnification eyepiece is the one with the LARGEST number on it.
The upside down image is normal for astronomical telescopes. The finder usually is a fixed focus, but it can be altered for various eye types, by rotating the objective lens for focus - the cell should move in or out on fine threads.
the image in your telescope is suposed to be upside down (you'll find it's back to front too!). The reason for this is to get as much light to the eye as possible, the more lenses/mirrors the light has to go through/reflect off, the greater the light loss, and in astronomy you need all the light you can get.
For terestrial viewing, you can purchase, quite cheeply, an image erecting adaptor. This will make your image the right way up. For the best terestrial viewing, you can still purchase prismatic adaptors. Best bet would be ebay.
If I can be of any further help, don't hesitate
As we all learned in grade school, telescopes produce an upside down image - it's okay for astronomical use since upside down doesn't matter. If you want an image like you'd see in a pair of binoculars, get an image erector from a telescope accessory store to add to your eyepiece.