Guide :Optics : Optics

Lesser viewing area in my telescope

I am trying to make a telescope on my own. It is showing good results also. But the viewing area that I am getting is very small. Even to read a small board I have to pan my telescope.I have used a double convex lens of 1000mm focal length with 100mm diameter, and a double concave lens of 200mm focal length for eye-piece.I have fixed these two in sliding tubes and that's all.Please advise me what I should do in order to get a wider viewing angle.Thanks and RegardsLal

Research, Knowledge and Information :

Advice for choosing a telescope - Homepages at WMU

Choosing a Telescope. ... galaxies, stars, the Moon) viewing. All telescopes can be used in some ... cover a larger area. It's easier to find your ...
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Using a telescope |

Jun 30, 2004 · Using a telescope. Now that you've ... the planet's rapid rotation brings nearly all of its visible area into view ... Next, place the less apparent belts ...
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Sponsored by telescope - Celestron

Telescopes flip the view of your target, ... “test-drive” a telescope? Yes. Look in your area for an ... reflectors are less expensive than other telescope types.
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What Can You See With a Telescope - Deep Sky Watch

What Can You See With Different Telescopes ... when it's in the milky way area, ... An example of how the jupiter looks in a medium telescope's whole field of view at ...
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The Advantages of Portable Telescopes -

The Advantages of Portable Telescopes. ... Multiple Viewing Points. A portable telescope can be ... It considerably increases the scope and range of area covered ...
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Telescope Equations: Magnification - Space Web

Telescope Equations ... I can see less of the sky around it. ... So to find what the field of view will be in your telescope, ...
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5 Best Telescopes - July 2017 - BestReviews

Our team of experts has selected the best telescopes out ... If you’re using your telescope to view ... This term refers to any artificial lighting in your area ...
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help selecting telescope - Beginners Forum - Cloudy Nights

help selecting telescope ... My viewing area options are dark skies ... My guess is I'll be more interested in viewing more objects each for lesser time period than ...
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Astronomy and Telescopes: Frequently Asked Questions ...

Astronomy and Telescopes: Frequently Asked ... on your telescope to view the Sun. Doing so ... enhance your viewing if you live in a light polluted area.
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The Best Telescopes for Beginners - Easy Buyer Guide and ...

The Best Telescope for Beginners – Easy Buyer Guide ... any other telescope the darker your viewing area is the ... garden where there is reletively less ...
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Suggested Questions And Answer :

Lesser viewing area in my telescope

All telescopes have small fields of view-- even what is called a "rich field scope" has only about 2 degrees of view. Most scopes only have about 1 degree of view.The key component is a short tube and a fast mirror of F4.5 or faster.
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I can not get the telescope to focus. The viewfinder will not focus in. and can't see anything out of the out of the optical tube.

This type of telescope is viewed from the small tube at the rear. Use the longest lens you have. Most people think that they need magnification, but that is not accurate. A 5 mm lens will only have 1/6th the field of view (how much sky you see) compared to a 30 mm. The picture below was taken through a 50 mm lens.
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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.
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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 the scope the supports the viewing prism/mirrow and the cross braces that support it, am i trying to view a subject that is "too far" i am VERY new to all this and i am using a celestron 114EQ scope from new any help appreciated Ray

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.
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Science Tech 262 telescope image problems.

TOO much magnification! Hate to tell you but the MAXIMUM magnification for any telescope (all things being perfect-- like optics, and sky conditions) is 50 times aperture. So max for you is about 125 power.Normally only about 30-40 times aperture is possible. So about 90 power is your normal max magnification.We see this every Christmas. People buy scopes that say 275 power or 500 power on the outside of the box. It's a LIE!Even in my 8 inch LX90 I rarely go above 200 power, and only when the sky is clear and very stable. Use the eyepiece with the largest number written on it which will be your lowest magnification.
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Neighbors 9 year old bought a Edu Science telescope at a yard sale. It appears to be missing the main lenses. On the viewing barrel is the name and the words coated optics; DIA. 76mm and F=700mm. No other markings or model #'s are available. What can be done to bring this back to operating level and is there an instructional manual available? The mirror and reflecting prism are fine, and the spoting scope also. Thanks John

You can buy a new lens, or several lenses, for the telescope. You can find them on e-bay. Just look for your make and model and pick out different mm lenses for your style of viewing!
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Optic lens are a blurr

Find the quick manual for download at for model number 1607225
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View finder is upside down is this normal - Barska Optics Barska AE10094 - 70060, 525x Enthusiast Telescope with Tripod&Carrying Case- Refractor Type Scope (7...

Yes, all astronomical telescopes and some finder scopes show images upside down.
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Can't see object with 6450 Telescope

You cannot use high power in those small telescopes. Only use the eyepiece with the largest number written on it. I know the box said 600 power--- it was a complete LIE! The maximum magnification is 50 times aperture. You probably have something like a 2 inch lens. So 100 power is the maximum usable power.Next time buy a telescope similar to this one:
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Bought a Geovision Precision Optical Omega Reflector telescope with a manual from a garage sale, please help locate the instruction manual, or tell me how to get the view right side up.

The view through an astronomical telescope is always upside down. When your looking at stars and planets, it makes no difference. If you want terrestrial view, get spotting scope - that's not what reflectors are for. If you still insiste on view right side up, you'll have to buy and inverting eyepiece or adapter and probably spend more than you paid for the scope.
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