Question about Tasco Luminova 40114675 (675 x 114mm) Telescope

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The eyepiece size (diameter) is the standard 1.25 in.
Erecting eyepiece adapters can be used with this scope.
maximum magnification is 250x therefore highest eyepiece would be 3.6mm
most useful magnification of any scope is 150x (900/150= 6mm eyepiece
Eyepieces provided with scope (Huygens type) have a narrow field of view and are relatively poor for astronomy but should be fine for terrestrial viewing

Posted on Mar 11, 2011

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About my tasco 46-060675 D=60mm F=900mm come with 3 eye lense 1(sr4mm) 2 (k10MM) 3(k25MM) and two tube 1(1.5x erecting eyepiece) 2 (3xbarlow lense

The different eyepieces are to give different magnifications. This is worked out by dividing the focal length of the telescope, f = 900, by that of the EP. So the 25 mm Kellner (that is the type of optics in the EP) will give 900 / 25 = 36 times magnification.

The erecting eyepiece is used for terrestrial viewing. Normally with an astro telescope everything is upside down as that does not matter when looking at a star. So when you want to look through someone's bedroom window you use this.

A Barlow lens is an add-on magnifier. If you add this onto any EP (it normally fits between the EP and the scope) it will increase magnification x 3.

There is a practical limit to what any scope will deliver, governed by its aperture (the size of the front lens) and for your scope this will be about x 120 magnification. Beyond that the image becomes too dim and fuzzy. This means that your 4 mm eyepiece ( x 225 magnification) won't be much use. It will be hard to find the object you are trying to observe, it will be hard to focus, and the image will wobble around. Nor is your barlow lens much use either I fear.

You might consider another eyepiece around 18 mm to give a nice spread. A Plossl type is good. If you get serious about astronomy, I think you will immediately want a better scope after using the Tasco.

Mar 23, 2015 | Tasco Optics

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How to use my telescope to stare better at moon, venus ...etc

1. Download stellarium at (free) This will tell you where to find the planets.
2. Do not use the erect image eyepiece for astronomy, It is for terrestrial viewing only.
3. Buy a moon filter. They are inexpensive ($12 at Agena Astro and others)
4. Huygens (H20, H12.5) are VERY cheap eyepieces,They have narrow field of view and low contrast. Purchase a good plossl or better eyepiece, you will really see the difference.
5. The SR4 (symmetrical Ramsden) is another cheap eyepiece. Avoid eyepiece designs that were invented in the 1700s. See item 4 above.

Mar 16, 2013 | Optics

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Is there any other way you can find out the serial and model name -number of an older meade telescope .Im looking for a replacement part(diagonal mirror ).Im seeing every thing upside down..I was told it I...

No they do not keep track of serial numbers only the main model number like LX200, LX90, ETX, etc etc--

Everything is ALWAYS upside down in an astronomical telescope. It's normal!

No up or down in outer space. Read my tips on my profile page.

They do make an "erecting diagonal" for terrestrial viewing. Just google "erecting diagonal".

Feb 12, 2011 | Meade EU-40 AZ-P Telescope

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How do I fix the upside down image

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 if you want a telescope primarily for terrestrial use, you are much better off buying what is called a "spotting scope".

If the telescope has a standard 1.25 inch diameter eyepiece, then an erecting eyepiece may be found on Amazon or eBay. An erecting prism or diagonal of the type that bends the light through 90 degrees is not right for a reflecting scope. These are used on refractors.

Feb 01, 2011 | Fieldvision 114mm Reflector (114 x 114mm)...

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My image is reversed... I am looking at the ocean and the beach and the image is reversed...

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. One type of erector will make the image appear right way up, but still reversed from side to side. That seems to be what you are using. If you want to use the telescope for terrestrial viewing, you will need a fully erecting eyepiece, or a fully terrestrial telescope (these are often called "spotting scopes").

Jan 16, 2011 | Tasco Galaxsee 45-060675 Telescope

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Never owned a telescope and was looking for one in this price range daytime terrestrial viewing would be a plus considering meade 90az adr or cellestron powerseeker 80 eq. any suggestions ?

Try to get at least a 90mm refractor. However we usually recommend REFLECTORS like this one for beginners.
More aperture at lower cost than a refractor.

All astronomical telescopes show upside down images in the eyepiece. You can buy an "erecting prism diagonal" to use for terrestrial viewing. Like this one:

Read my TIPS on my profile page and also these two web sites:

Jul 15, 2010 | Meade 90AZ-ADR Telescope

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Looking for an attachment for the edu science astro nova 100 that will give upright images. In the cd that accompanied the telescope mention was made of this attachment. I belive this will make the...

You only use this for terrestrial viewing, all astronomical telescopes show upside down images. It's normal.

However, what you need is called an "erecting prism" these are available from several on-line retailers. Here is one for sale:

You have two problems: First the erecting prism probably costs almost as much as you paid for the telescope. Second they usually come ion 1.25 inch size, your telescope may be a .965 inch. Measure the hold where the eyepiece goes and see which size you have.

Sometimes Telescope Warehouse on Ebay has the .965 size.

Apr 16, 2010 | Edu-Science (10166) Telescope

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How to focus telescope lens for city viewing?

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.

Jan 31, 2010 | C-Star Optics Optics

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Problems with the ercecting lens

Did you put the eyepiece into the diagonal? ------- after you put the diagonal into the telescope. Erecting lens is a DIAGONAL by the way. "erecting diagonal"

Jun 14, 2009 | Bushnell Voyager 78-9440 (440 x 12.5mm)...

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Bushnell Deep Space Series 525x 78-9500 We didn't assemble when we received as a gift a couple of years ago and now realize that the assembly instructions were left out of box. We assembled telescope but...

The erecting prism can be used for both terrestrial and star gazing-- put it innto the scope first.

The 3x barlow probably will NOT be very useful... it triples the power of any eyepiece. Your small scope cannot go much over 100 power-- before the image degrades.

Put the eyepiece with the BIGGEST number written on it into the erecting prism which you previously stuck into the scope... now go outside during the daytime and practice focusing on a distant object.

The bigger the number on the eyepiece the LOWER the magnification.

Apr 13, 2009 | Bushnell 525x Deep Space Reflector...

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