Question about Bushnell Deep Space 78-9003 (525 x 76mm) Telescope

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I have what looks like a silver metallic disk that fell out of the scope and I can't find where it might go. I can't seem to focus it.

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If this is a reflector telescope, did the small secondary mirror located beneath the focuser hole fall out?

This mirror sends the light from the main primary mirror out through the focuser. Watch this video to get an idea of how this works and how to replace it.

Posted on Aug 06, 2010


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1 Answer

I have a Leica Televid 77 with a 20x - 60x zoom ocular. The scope fell over and now the zooming knob is difficult to turn. The zoom does still work, it is just much harder to turn than before. The...

Yes you bent the shaft on the knob or the gears inside the focuser. Order another complete focuser from Leica.

Aug 01, 2011 | Leica Televid 77 (60 x 77mm) Telescope

1 Answer

I got an inphase telescope for a present secondhand. There are no instructions and I have never used one before, could you advise me please?

The bit of information I can find on this model tells me this scope is probably a Newtonian reflector Telescope.

The following is the most basic steps I can think of to get you in the driver's seat.. by doing a few simple internet searches in regards to astronomy.. you should be able to greatly expand on my few simple tips.

The primary mirror is at the bottom.. the heavy end.. of the tube... if you can see screws holding it in place... resist the urge to "tighten them up".. doing so will probably misalign the mirror.

You should have a small finder scope mounted on the side

Near the finder scope will be the eyepiece/holder with focuser.. all this should be closer to the skyward end of the scope than the earth end of the scope.. so to speak.

As you peer into the eyepiece you are basically looking at a right angle to the primary mirror into a smaller secondary mirror which in turn is reflecting the image of the primary (bottom) mirror. By adding various eyepieces with different magnification factors you are enlarging that image.

Most folks don't realize how bad a typical looking glass mirror is..but if you look really close at the old bathroom mirror.. you will see how much the glass distorts the image reflected on the silver coating.

Which is why your telescopes mirror has a top coating of silver on the glass.. not behind the glass..

To get started..

I suggest doing all of the following things during daylight hours or near dusk on a clear nite so you can see what you are doing.. to get familiar with the scope.

Using the lowest powered eyepiece you have.. once inserted into the focuser .. aim the telescope at an object a few hundred yards away and attempt to focus..

Remember that everything will be upside down.. looking at the moon, planets and won't really matter.

Once you have managed to point and focus easily.. you can align your finder scope.. again.. using a fixed terrestrial target

Aim the scope at this object.. the further away the object is.. the better.. get the object as close to center as possible.. slightly increase the magnification if you have a stronger eyepiece.. if not.. proceed.

Fix the scopes position by tightening any set screws on the mount.

Check the position of the spotted object again ..make adjustments until you have the object centered.

Look through the finder scope.. adjust the mount screws until the object is centered in the crosshairs..

Check all settings.. your done.

Start out looking at the brightest objects in the nite sky using the lowest magnification..

Once you become familiar with how to find/spot and focus on simple bright objects.. like the moon and perhaps Jupiter... you can read various articles at websites such as Sky and Telescope to learn how to properly align your scope with the polar (north) star.. of course this depends on the type of mount.. and drive if any... Or simply enjoy point and look backyard astronomy.. some of my most fun star gazing has been using bincoulars.. a star chart.. and a lounge chair.

Remember to keep it simple at first.. be ready to dress warm.. and take your time.. your eyes will need almost 30 minutes to really adjust to nite this cooler weather it helps to let the scope cool down for a while outside (covered) to keep things aligned properly.. of course the darker it is the better the view..

Even inexpensive scopes can give a lot of satisfaction to a point... especially if it's your first..

Good luck!


Jan 30, 2011 | Optics

1 Answer

When i zoom it all the way to 9 it gets blurry.

The rear lens may have to adjusted for focus at this magnification. If you adjust it at this setting it may be better in focus in the lower settings for you.

Jan 08, 2011 | Nikon ® Buckmaster® Rifle Scope - 3-9 x 40...

1 Answer

I bought and assembled telescope but we are new to telescopes and cannot see anything. I put the lense in correctly. I pull out the bottom cap and can see myself in the mirror within the tube. On the...

POINT THE END with the cap toward the sky. The mirror is on the bottom of the scope. Then put the eyepiece with the largest number written on it into the focuser, practice focusing on a distant object during the day time.

Nov 12, 2010 | Meade 114EQDH4 (36 x 114mm) Telescope

1 Answer

All of a sudden it is out of focus. No rattling. This is a Tasco 3x22 pro-class.

most comon thing this is,,its your scope,,its fell to bits inside, one or the lenses has moved or tilted a little, they dont normaly rattle

Sep 19, 2010 | Optics

1 Answer

I have a used tasco galaxsee ,model 46114675,114x900 20 mm wide angle eye piece,no manuel.i have never owned a telescope before.problem:I can find objects in the sky,the few i have looked at are all the...

You are OUT of focus -- turn the focus knob until stars are POINTS of light NOT DONUT HOLES!

The disk with a dark center MEANS it is not in focus. Just TURN THE KNOB. Point the scope at the moon and try again.

Sep 01, 2010 | Tasco Luminova 40114675 (675 x 114mm)...

1 Answer

I assembled it without a manual because i cant find one, and i cant seem to work it everything looks good but with the lense i cant quite seem to work it, ...

Put the eyepiece with the largest number written on it into the focuser. DO NOT use the 2x barlow if you have one.

Go outside during the day time and practice focusing on a distant object using the eyepiece mentioned above.

Line up the small finder scope with the main tube-- point the scope at the top of a distant telephone pole or church steeple.

Without moving the scope, line up the cross-hairs in the finder scope with the same object. Once this is lined up you can use the small finder scope to locate objects in the sky.

Read my TIPS on my profile page.

Jul 14, 2010 | Citiwell International Orbitor 5500...

1 Answer

Having a clear sky last night i took my new scope out and started to view the night sky, but focusing on a star ! i found that when viewing it at magnification a could clearly see the the area infront of...

Stars are ALWAYS pinpoints of light when the scope is focused no matter how much magnification is applied.

You are NOT focused properly -- when you are you cannot see the secondary mirror or the "spider" bracket that holds the mirror.

You will NEVER see a star as a disk, only as a pinpoint light. If you are seeing what looks like a donut with a dark center you are not focused.

May 07, 2010 | Celestron PowerSeeker 114 EQ Telescope

1 Answer

There is a round silver disk (seemingly made out of card board) that fell off. Can it be replace with another cardboard cut out in the same shape?

the disk is just a microwave diffuser but, it is made with a special foil do not put regular foil into a microwave for any reason; just glue the disk back on with ordinary glue

May 20, 2009 | Microwave Ovens

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