Showing posts with label Telescope. Show all posts
Showing posts with label Telescope. Show all posts

Idea of the Reflecting Telescope

Having telescope will become one of the best things in your life, especially if you own the reflecting telescope. It is the unbelievable thing that will amazingly enable you to see the stars and even planets intimately, and all the things will be the same as the fancy world. There is no limit for people to unravel about the hidden fact of the universe, and it is one of the steps to do that. By using the telescope, space seems to be close to you, but you need to understand about the proper way and places to purchase that one.

Purchasing the Right One

The first thing you have to know before eventually buying the reflecting telescope is recognizing the fact that there are lots of types of telescope obtainable on the market. And every telescope comes up with its own good sides and downsides. One of the instances is the Newtonian reflector telescope. Additionally, you can select the other kinds as well.

It means that the word "best" is really relative, and cannot be generalized for all people. There are three types of telescopes offered for beginners: the Newtonians, achromatic refractors, and the Dobsonians. If you are the beginner, the most common first scope like a 70mm or 80mm achromatic refractors will be the great selection to get you started. What about the Newtonian telescopes?

The next consideration you need to have in buying the reflecting telescope is accessories. In this matter, please ensure that you get the right ones, and there are quite a few selections that you can pick one of them. The different focal lengths of eyepieces will help you by providing different magnifications of reflecting telescope.

There will be no benefits of having reflecting telescope that completed with great technology if you cannot use that tool rightfully. The only reason is that because it needs much money, and will be the expensive investment. It will be silly of damaging the telescope because of your inability to know how to use it, right?

How to Find a Telescope Shop

Buying a telescope is one of the best things you can do. A telescope allows you to navigate the heavens. It is a good idea to check out a telescope shop, the question is how do you find them? This article is aimed to help you discover that.

Summary of contents:
* Why Buy A Telescope From A Telescope Store?
* Finding A Telescope Shop
* Great Tips To Buying An Astronomical Telescope

* Why Buy A Telescope From A Telescope Store?
There are several benefits to buying a telescope from a telescope shop. The biggest benefit is that you get to see all the different telescopes available. This is not as good when it is done online, as you only have a picture to go by.

Buying from a telescope shop also has the benefit that you can ask a sales representative about astronomy, and which scientific instrument will be serve you. There are many different types, so having an idea of what you want can help. Looking online, there is much information to help, however, a salesperson maybe able to give a unique perspective, as many of them are interested in astronomy.

* Finding A Telescope Shop
Telescopes are not as popular as groceries! This makes finding these stores a difficult task. It is like searching for a needle in a haystack.

There are still many stores dotted around the world. If you are willing to travel, you can go and find a telescope store. The difference is that it depends if you are willing to make the travel.

There are several ways to find these telescope shops. Here is a summary, and we will look at them in more detail:
* Yellow Pages
* Newspapers & Classifieds
* Magazines
* Online

* Yellow Pages
The Yellow Pages is one of the first places that it is wise to look into to find telescope stores. The best sections to check are Binoculars & Telescopes section or Photographic Equipment. Depending on the amount of stores within the area covered there may be some details there.

* Newspapers & Classifieds
Another great way to find telescopes is to look through newspapers and classifieds. In most cases these adverts will be for used models, however, if you are looking for a bargain, this is the best route for success.

* Magazines
There are a few dedicated magazines that deal with astronomy. Magazines such as Sky & Telescope have many details for stores. Though this is a US based magazine, there are others that deal directly for the country you reside in - in most cases.

* Online
Buying online is great; the only problem is that you can't see the telescope. The truth is that researching online can help you find a local store.

* Great Tips To Buying An Astronomical Telescope
Make sure you look online. Though buying through a store is great, the truth is that great savings can be made online. There is also the benefit that you can find a bigger range.

Make sure that you have adequate space for the telescope. They take up more room than what would seem apparent, considering that they need space to move around.

Telescope Binoculars - Choose the Right One

Astronomy is a fascinating subject and space is a great mystery. I can bet, every time you look at the sky, it looks different and stimulates curiosity in your mind. Stargazing and sky watching are very popular hobbies among children and adults. However, scientists use telescope and not binoculars because of the long range they offer. Often, they use very high end electronic telescopes as they have a totally different approach: They use radio signals to find objects that are thousands of light years away.

For people like you and me who are looking for something to pursue our star gazing hobbies or want to help our kids learn more about the sky, telescope binoculars for astronomy are the best choice. Telescope binoculars combine the good features of both telescopes and binoculars. There are a wide range of them available on the market, right from low end (under $100) astronomy binoculars which are good for bird watching to higher end ones that can show you rocks on the moon. There is obviously a quality and cost factor that comes in to picture, the farther away you would like to see, the better optics you need, and usually, the higher the price you pay.

Let us now see how you decide what is good for you and what specifications you look for when you are in the store looking at a variety of telescope binoculars. First thing to look at is the Objective lens size - the diameter of the front lens. Since your interest is to buy something to help your astronomy viewing, you should look for the ones with at least 50mm diameter. Of course there are telescope binoculars with apertures as high as 100mm and more. The greater the lens size, the higher the aperture, the more light the lens gathers and hence you get to see objects that are very clear even when it is very dark. Binoculars with aperture less than 35 mm will give disappointing results, if you want to look at the stars.

The other important specification is the magnification. That tells you how far you can see through your telescope binoculars. If the magnification shows 7x, it means you can see an object 7 times closer and if it is 25x, you can see 25 times closer than with the unaided eye. Normally you would see specifications in a format like 7x40mm which means the magnification is 7 times and the lens aperture is 40mm. With a wide range of options, you can easily get carried away and buy something that has high magnification and a huge lens - but then it will lose the mobility factor as you would need a tripod stand to avoid shaking of image. Even the slightest of movement can be a cause for a badly shaken view. In general, any astronomy binocular with an objective lens size over 70mm will require you to use something to stabilize it for great viewing.

So if you are an amateur or looking for telescope binoculars for your kid who is attempting astronomy for the first time, go for something like a 10x50mm which can show you details on the moon and will cost you less. If you are taking your astronomy studies to the next level, go for something like a 25x100mm that can show you things like moons around Jupiter.

Know your needs and choose the right one!

Telescopic Binoculars for Astronomer

All thanks to the man who first invented the first telescope. Unfortunately he died anonymous. As they say, the Great live and die in silence. But Hans Lippershey who popularized the use of it was luckier to be recognized. Later on its use was extended to the skies by Galileo Galilee in the study of astronomy. With his first astronomical telescope he introduced the heavens to the world. Being the first of its kind, it had its limitations. The arrangement of the glass lenses hindered further magnification. This was in the year 1609. Almost 100 years later another great scientist Sir Isaac Newton altered the telescope inserting a curved mirror that would absorb the light and reflect it to a particular point of focus which magnified objects millions of times greater than the ordinary lens. The telescopes that you and I use today follow the same designs but with larger mirrors and improved technology.

The telescope as the word suggests is an instrument facilitating the extension of a scope to a far distance. And the binocular is an extension of the telescope in usage. Telescopes collect more light and provide high resolution images allowing greater details to be seen of greater distances. They come with different eyepieces for different focal lengths and are hence very flexible in configuration. But the monocular design, heavier weight and high costs makes it necessary to look at a more comfortable replacement.

Binoculars, unlike telescopes are fitted with two objective lenses and prisms, one for each eye, making them more comfortable to use and cheaper due to its low weight and size. But the power of the telescope does not come with the binocular.

Looking at the negatives of both these instruments, some optics geniuses thought of combining their positives and landing at a fresh combo which would be called the telescope binocular. This would be the best of both with the powerful lenses of the telescope and the very comfortable design of the traditional binocular. Some models even come with interchangeable lenses making different fields of view available. So the built-in lens of the binocular is done away with. If any of you out there is a budding astronomer, then you can be sure you have your best bet here. To see a great discussion about these instruments, look here astronomy binoculars.

Telescope binoculars are especially for the purpose of astronomy. They can however be used for other activities like bird watching or any such activity. Tailor made for the discovery of the skies; they are bulkier than the friendly binoculars and must be handled with care. But with no setup time, and easy portability, to the astronomer this combo pack has been a boon.

The high power astronomy telescope binoculars for amateur astronomers should not be confused with the the Large Binocular Telescope (LBT), which has been atop Mt. Graham in Arizona, USA, the result of over two decades of effort, and is the largest telescope to have ever been made in terms of light collection capacity. Its resolution has been unrivalled by any other optical telescope so far. Not even the very sophisticated Hubble Space Telescope. Ever wondered how the first stars and galaxies formed or what the world beyond our solar system really looks like? Then you might get some clues to your curiosity from the LBT. It is one of the most remarkable advances in the quest to know the unknown. But why is it called a Binocular Telescope? That's the topic of another article.

Spitzer Telescope Detects Dust Around

Dust plays an important role in the evolution of galaxies like our Milky Way.

With the help of NASA's Spitzer space telescope researchers have observed dust forming around the carbon star MAG 29, located 280,000 light years away from a smaller galaxy called the Sculptor Dwarf . Stars more massive than the sun end their lives as carbon stars, which in our galaxy are a rich source of dust.

The Sculptor Dwarf contains only 4% of the carbon and other heavy elements in our own galaxy.

The more we can understand the quantity and composition of the dust , the more we can understand how stars and galaxies evolve.

Telescope Making History

Many people have contributed to the development of telescope making, none more significantly than William Herschel.

Herschel's Contributions:

Born in Hanover, Germany, Herschel settled in England in 1757, where he became interested in astronomy and later (1776) turned his attention to telescopes. Working entirely by hand, at first as an amateur, he practiced and developed his technique on a great number of telescopes in the style of Newton and learned how to figure the mirrors far better than had any of his predecessors. He performed the polishing in the conventional manner, with the mirror on top, and used a sweeping, circular stroke for parabolizing.

Later, Herschel applied himself to the design now referred to as the Herschelian type, which had been proposed by LeMaire, a French scientist, in 1728. In this design, the mirror is tilted so that the image is thrown to one side of the open end of the tube, where it can be examined in comfort, with the observer's back to the object, and without the introduction of a second reflection.

This latter feature was of tremendous importance in the days of speculum, when 40 per cent of the light was absorbed in undergoing a single reflection. Of less importance, but nonetheless gainful, was the elimination of the harmful diffraction effects from the secondary mirror. But unless a suitably high focal ratio was chosen, astigmatic images resulted from the inclination of the mirror. And this introduced another problem; the lengthening of the tube meant placing the observer at an awkward height.

In 1789, Herschel completed his largest reflector, of the tilted-mirror type, which was installed at Slough, near Windsor. The speculum was four feet in diameter, with a focal length of 40 feet. It was about 3½" thick, and weighed about 2,100 pounds. An elaborate and ingenious trestlework was built to carry the observer.

This great mirror was exceeded with the completion in 1845 of the largest of all specula, one six feet in diameter and 54 feet in focal length, by the Irish astronomer, Lord Rosse. This was a major step in telescope making.The metal disk was nearly 6" thick, and weighed about 8,380 pounds when cast. Rosse's gigantic instrument was mounted at Parsonstown, Ireland.

As representative of the prices Herschel charged for his reflectors, a Newtonian model of 6½-inch diameter and seven feet focal length sold for 100 guineas (30 guineas for the optical parts). Another 8.8-inch Newtonian, 10-foot focus, cost 200 to 300 guineas. Herschel advised buying two mirrors for this latter instrument (which probably accounts for the variable price) so that one could be used while the other was being repolished!

His talents were not confined to the making of fine specula; he also made his own eyepieces, some of which were truly remarkable. His frequent references to the use of magnifications of some 7,000 on his 6½-inch reflector occasioned some speculation and controversy among the English astronomers, but his claim appears to have been justified by the discovery, comparatively recently, of some very tiny eyepieces made by Herschel.

Among his effects at Slough, W. H. Steavenson found several of these eyepieces, varying in focal length from about 1/16" downward. The smallest of these was examined in a microfocometer, and found to have a focal length of 0.011". It was bi-convex, about 1/45" in diameter, and 1/90" in thickness.

It was tried out on a 6-inch refractor, and performed as creditably as its power would permit, but its field in that instrument was only about 20 seconds of arc in diameter. If Herschel actually used this eye-piece on his 85.2" focal length reflector, it would have given a magnification of 7,668.

The History of Older Telescopes

An investigation into early telescopes makes for interesting reading. In 1722, John Hadley, an English mathematician, completed a form of reflector for the telescope in the style of Newton in which the mirror evidently was suitably figured. This instrument attracted considerable attention, and presently other makers were turning out Newtonian reflectors, following Hadley's technique, which consisted of removing the spherical aberration as it was revealed by the extra-focal diffraction rings of a star image.

Hadley then turned his attention to a design by James Gregory and in 1726 he produced an instrument slightly over 2" in diameter and 12" in focal length. This proved so successful that construction was undertaken by others.

Notable among these was James Short, who made both Newtonians and Gregorians in great numbers, from about 1732 to the time of his death in 1768. Observatories purchased his larger instruments, a tribute to his skill, and the smaller ones were marketed chiefly among the aristocracy and amateur astronomers.

The principal attraction of the Gregorian design was the erect image it gave, which made it suitable for terrestrial use. This circumstance influenced its preference over the Newtonian, notwithstanding the fact that its images must have been pretty dull. Well into the 19th century, however, the Gregorian rode a wave of popularity that no type of telescope has known, until overwhelmed in comparatively recent years by the flood of amateurs who have flocked to Newton's design.

From the time of the invention of the telescope, and the startling discoveries of Jupiter's moons and the rings of Saturn, interest in astronomy had become something infectious. Each new discovery was accorded the widest publicity, stimulating a desire among those of learning to gain at first hand a glimpse of these celestial wonders. It was not practicable as yet for the average individual to make his own speculum, but many contrived to fit spectacle lenses into tubes, much as Galileo had done some 150 years earlier. This in fact was one of the first of the early telescopes.

Those whose means permitted bought telescopes, and envied was the gentleman who possessed one of three or four inches aperture, by an "exclusive" artist. But, judged by present-day standards, many of those reflectors were tiny. There is one (maker unknown) in the Fugger Collection at Augsburg, barely 1" in diameter and 6" in focal length, that was concealed in a walking stick! Eyepiece lenses of 1/6" or less in focal length were quite common.

The metal used in those early mirrors was an alloy of copper and tin, the usual proportion about 75 to 25, which could be given a beautiful polish. But the metal was extremely hard to work, and a prodigious amount of labor was involved in grinding and polishing the curve. To facilitate the work, the comparatively thin disks were cast to the approximate curve, the backs also being curved to give uniform thickness and equalization of temperature effects. Grinding was done on convex iron tools of similar radius, using emery, and sometimes sand. Polishing was done on a pitch lap, with rouge.

Manufacturers usually devised their own machines to do the work of grinding and polishing. Except where the utmost perfection was imperative, figuring seems to have consisted for the most part of a final brief variation of the stroke, in an unguided attempt to concentrate the polishing at the center. Critical testing, undoubtedly seldom indulged in on account of its laboriousness, could as yet only be performed on a star. In reflective ability, speculum was only about 60 per cent efficient, and the surface tarnished rapidly, effecting a further serious light loss. This meant frequent repolishing, and repolishing meant refiguring.

It is interesting to inquire into the prices that were asked for telescopes in that period, the latter half of the 18th century. Listed below are prices and sizes of a few of the Gregorians made by Short, selected from his catalogue. Newtonians in similar sizes were priced only slightly lower.

Diameter (inches) Focal Length (inches) Magnification Price (guineas)*

1.1 3 18 3

1.9 7 40 6

4.5 24 90-300 35

6.3 36 100-400 75

18 144 300-1,200 800

*An English gold coin, issued until 1813, equivalent to 21 shillings, or about five dollars.

The early telescopes were certainly gaining popularity by this time.

Best Telescope to Get Into Astronomy

If you want to get into astronomy, there is only one way, and the best way is to buy a telescope. The best telescope will allow you to get the most out of astronomy. As you read this article, you will soon discover what the best telescope is.

In this article, you will soon discover:

* What Is The Best Telescope?
* Choosing Between Reflector and Refractor Telescopes
* Getting Into Astronomy With Computerized Telescopes
* How To Find Telescopes For Sale?

* What Is The Best Telescope?

The best telescope can mean different things for different people. The best telescope for some people could mean the most expensive model. The truth though is that the best telescope is one which allows you to get years of enjoyment out of astronomy.

This then comes down to several factors, which we will be looking at further into this article. For example, is it for a child, is it for a teen or an adult. All these factors need to be looked at to discover which the best option is.

* Choosing Between Reflector and Refractor Telescopes

Refractor telescopes are often the ones that are thought of as telescopes. They have a long tube, and like binoculars which work with similar principles, you look from the back and the light enters from the front.

Refractor telescopes are great because they are very low maintenance. This is the best route for buying a telescope for a child or a teen. The ease of use makes it a very great way to get into astronomy. With children, it is essential to help them use the telescope, as even the small versions may still be bulky.

Refractors are great when it comes down to small sizes, however for larger sizes, the refractors cost can become immense, in fact in the thousands! This is not necessary as there is another type, and that type is the reflectors, which utilize a mirror.

* Getting Into Astronomy With Computerized Telescopes

Another option which is becoming very popular is the computerized telescopes. Computerized telescopes are great for many reasons. For example, computerized telescopes allow you to enter the code, and it zooms to the exact point, allowing you to view the object.

This saves a lot of time, considering how you would need to do it manually. This is automatic navigation of the universe, and is the greatest way to get into astronomy.

* How To Find Telescopes For Sale?

Finding a telescope for sale can be found in many ways. One way is through telescope stores; however there are not that many stores around. Another option is to look online, where there are many stores dotted around the world, who will deliver to your home.

Great Functions of the Hubble Telescope

As the device that can be used to view the object from the long distance has some kinds, and Hubble telescope is the well-known one. Further, it sent back the perfect image of "virtual" heavens above. This kind of telescope has the beneficial characteristic, including the capability for sending back the clear images to the Earth. And the telescope becomes the important aspect in the astronomy world.

Explain the Mysteries

Lots of astronomers claim that they are really assisted by the invention of Hubble telescope; even they can explain and study about the space's mysteries that have existed at the early of the time. They claim that explaining the origins of different stars in the universe is not a simple thing, but the Hubble telescope becomes the great tool that presents a lot of contribution for describing solar system.

The images offered by the telescope were certainly not all that sharp at the beginning. Even, it is probable for them to see the furthest galaxies by using the great telescope.

The images coming from the Hubble telescope are firstly stored in an archive and then brought to earth. It will guarantee the cleaner images and guarantee that people back on earth are able to see worlds that present far away via the clear images. Sure, it becomes the perfect device that gives great contribution to the development of astronomy.

This telescope, however, is primarily used for scientific purposes and lots of scientists prove it as the great device for solving the universe' mysteries.

Last in talking about the Hubble telescope, we can draw the conclusion that essentially we can unveil the universe's mystery by using sciences, followed by the great devices in the process of discovering the secret matters we never know before. Hubble Space Telescope is the real great facility for astronomers. The high degree of picture clarity makes it as the best one among any other telescopes.