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With a telescope fixed on mars on feb. 15 2010 at 1:00 a.m. how long before I need to adjust said scope

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Depends on the magnification. The higher the magnification the faster Mars will move in the eyepiece.

Posted on Sep 26, 2009


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How do I sight the telescope

The "finder-scope" as they are called can be lined up by putting a low-power eyepiece in the scope, and moving the scope (on its mount) to view a distant object such as a streetlight. An EP which gives you about the same magnification as the finder-scope is a good choice. They are mostly about x8 power.

Centre the object in the eyepiece view and then adjust the finder-scope until the object is centred in that view as well.

Repeat this with a higher power EP, then move the scope onto a bright star, and use the highest magnification EP you have to finally do the last tiny adjustment to the finder-scope.

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Calaminate my 525x76mm national geographic telescope

Unfortunately I can not get the manual for this. I do not think you need collimation at this time. You need to adjust the finder on the scope. Use the highest number eyepiece (lowest power) and point the scope towards a landmark during the day. Now look through the finder. Loosen the screws of the finder and move it until the finder LED is pointing towards the landmark. Tighten the screws.
Note: This telescope is more of a toy than a good telescope. Avoid scope that advertise max power in their name. This scope is unable to make 575x! Max power is 50x per inch of aperture on a very good night. 76mm=3in x 50 =150x max!

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I have a new Brookstone compact telescope. The image in the smaller viewfinder is upside down making it difficult to line up with image in main telescope. Is this normal? And if so, any suggestions for...

Astronomical telescopes usually show an upside down image. There is a good reason for this- erecting the image needs more bits of glass in the light path, which reduces the amount of light and increases aberrations. Even if this is only slight, astronomers prefer to avoid it, and they don't really care which way up the Moon or Jupiter appear. It is possible to fit an erecting prism or eyepiece to most astronomical telescopes, and some of them come with one, but one wouldn't bother to do this with the small finder scope.

Telescope manuals recommend that you align the finder scope in daylight, by pointing the main scope at an object on the horizon and adjusting the finder to match (never point a telescope toward the Sun!). Once you have a tree or mountain peak in the center of the main scope's image, you can then adjust the screws around the finder scope to get the crosshairs (or red dot) centered on the same object. It is very difficult to do this job in the dark, especially as objects in the sky are constantly on the move.

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I am having trouble seeing anything out of my telescope. I have repeated all of the steps.

Try focusing it towards the moon first(you wont miss it) then if you can mark that on your focusing knob(I taped mine with a masking tape).Then use your spotting or pointer scope(I'm sure most telescope comes with it, usually attached on top of the scope)to a faint object or if you have a star map you can locate to where mars is in the night you are observing.During daytime do focus it on an object you are familiar with on a not so far distance first then do it on a farther objects after that.

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Assuming the batteries are OK, there should be adjustment screws on the finder for moving the red dot around.

Focus the telescope on a distant object, then without moving the scope adjust the dot on the same distant object.

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You need to synchronize the telescope with stellarium. Center the telescope on a known star, then select the same star on the laptiop and 'synch' with it.

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The viewfinder is not acculimented with the telescope. what i see in the viewfinder is not visble in the eyepeice of the telescope what i see in the viewfinder isnt in view in the scope . how do i...

Point the scope to a distant object like the top of a telephone pole.

Without moving the telescope adjust the small screws on the finder scope to LINE-UP on the same object.

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point the telescope at some thing during the day and adjust the finder scope and at night point at a star look through the eye piece and center the object in the eye piece then adjust the finder scope.

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Something similar happened to me when I had done a quick align. I asked the scope to go to the moon, which was obviously visible above the horizon but it pointed downwards. I found out that I had entered the date (month day year) in the wrong order (day month year - as is common in Sweden). Just a long shot...


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Orion SkyQuest XT6 Classic Dobsonian

Mars is a tiny object at best, needing about 400x to view. We are now fairly well past opposition, so it is even smaller. That power would call for a 3mm eyepiece (6mm with 2x barlow is the equivalent). Try the highest power eyepiece that you have.

Apr 30, 2008 | Optics

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