Celestron 127EQ PowerSeeker Telescope

!: Good bargain Celestron 127EQ PowerSeeker Telescope save you money!

Brand : Celestron | Rate : | Price : $94.85
Post Date : Oct 26, 2011 15:09:18 | Usually ships in 1-2 business days

21049 With Free Motor Drive: CES1071 Features: -Telescope. -PowerSeeker collection. -Color: Black. -Material: Aluminum. -127 mm (5'') Newtonian reflector. -3x Barlow lens triples the magnifying power of each eyepiece. -Quick and easy no-tool setup. -Slow motion controls for smooth tracking. -Erect image optics - ideal for terrestrial and astronomical use. -Fully coated glass optical components with high transmission coatings. -Enhanced image brightness and clarity. -Accessory tray for convenient storage of accessories. -''The Sky'' level 1 planetarium software with 10,000 object database. -Dimensions: 11'' H x 17'' W x 33'' D.

• 3x Barlow Lens
• German Equatorial Mount
• 127mm Aperture
• 1000mm Focal Length
• Comes with aluminum tripod and accessory tray

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A Telescope Buying Guide For Beginners

!: A Telescope Buying Guide For Beginners

Buying a telescope is a daunting task for a newcomer. It all depends on your astronomy goals and careers. There is no perfect one which suits all observers in all conditions. You have to look for the features you want in your telescope and select the best one's according to your requirement.

Selecting the proper type
The refractor type telescopes best suit for watching moon and major planets. Refractor telescopes are long & thin, and known for their sharp, detailed and contrasty images. They collect light through multi-element lenses. If you are just a starter then a small, quality achromatic refractor of 60 to 90 mm aperture would be a good one. The best thing about a refractor telescope is that they are inexpensive, portable and almost maintenance free. A refractor telescope is also useful when you will be mostly observing from city or the surrounding areas where the night skies are lightly polluted. Reflector telescopes are also known as Newtonian telescopes. They are good for planetary as well as deep-sky viewing. However Newtonian telescopes are more fragile and need more maintenance than others. These telescopes collect light with a curved, concave mirror and with the help of their large apertures, they show fine, highly-resolved images. The reflector scopes are not suitable for terrestrial viewing because they produce an upside-down image. Catadioptrics use both lenses and mirrors to collect and focus the incoming light. They are also called compound telescopes. Catadioptrics scopes are considered the most versatile telescopes and gives great all-around performance. They use a large aperture in very compact tubes. They show magnificent images of the moon, planets and faint deep-sky objects, when viewed in dark skies away from urban areas. These scopes are best suited for astrophotography. Compared to other two, these scopes have a wide range of accessories available. They can be entirely computer controlled.
Factors affecting the performance of a telescope

Aperture: Telescopes collect light from distant objects and focus it to produce images. The light collecting capacity of a telescope is the most important feature. It is the aperture of scope (diameter of mirror or lens) that is responsible for gathering light. Larger the aperture, the more light gathered, the more you'll see. Telescope Mounts: There are three basic mounts for telescopes altazimuth, Dobsonian, or equatorial. Altazimuth is the simplest type of mount, providing up-down, left-right motions. It is mainly recommended for terrestrial viewing and casual stargazing. The Dobsonian mount was basically designed for easy maneuvering of large reflectors of more than six inches. It is a boxy altaz-type mount sitting close to the ground. Equatorial mounts are designed for the purpose of astronomical viewing. These mounts are more expensive and complicated than the altazimuth mounts. With the help of these type of mounts users can track or follow the motion of celestial objects through the sky with a single manual hand control. Magnification: Magnification should never top the priority for buying a telescope. The quality if image degrades with magnification. Practically 300X is maximum magnification for good quality images. Telescope's magnification is also known as its power and it is adjusted by changing eyepieces. Ideally there should have been three eyepieces for the magnification of a scope: one low, one medium and one high. Lower powers of 30 - 50X are recommended for observing galaxies, star clusters and nebulae as they are spread over a wide area of sky. For observing the rings of Saturn, Jupiter, studying craters and valleys of the Moon's surface medium power of 80 - 100X are advised. Higher powers of 150 - 200X allow the astronomers to observe mountain peaks and fine lunar detail, the surface features of Mars.

A Telescope Buying Guide For Beginners

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Should I Buy a Reflecting Telescope Or a Refracting Telescope?

!: Should I Buy a Reflecting Telescope Or a Refracting Telescope?

Understanding Reflecting Telescopes and Refracting Telescopes

Telescopes are great tools for looking at objects in the night sky and the key part of any telescope is the objective. The objective is what allows light into the telescope enabling you to see the images from the sky. Telescopes with bigger objectives allow more light in and that means a clearer and crisper image for the viewer.

The two main types of telescopes are reflecting telescopes and refracting telescopes. These are similar in design except for the manner in which they collect light.

Differences Between Refracting and Reflecting Telescopes

The objective in refracting telescopes is a piece of glass that is located near the front of the telescope. The objective takes the light that it gathers and refracts, or bends, it to send it to the eyepiece, which magnifies the image. Refracting telescope technology is used in other equipment like binoculars, rifle scopes and spyglasses.

Reflecting telescopes are different because the objective is a mirror at the distal end of the telescope instead of a glass lens at the front. The mirror in a reflecting telescope has a concave shape, a bowl like shape, which allows it to capture the light in the center of the mirror and send it as one stream of light towards the eyepiece so the image can be seen.

Benefits of Using a Reflecting Telescope

Reflecting telescopes are preferred by many for several reasons. One reason is that there is less distortion with a reflecting telescope than with a refracting telescope since the mirror is able to gather and reflect all wavelengths of color consistently. The use of the mirrors instead of glass lenses makes reflecting telescopes more affordable than refracting telescopes.

When mirrors are used instead of glass lenses, the telescope can be enlarged to allow for the supports for the mirror to be located on the posterior of the telescope. The larger the mirror that is used, the more light that is reflected and the better and clearer the image will be.

Disadvantages of the Reflecting Telescope

Reflecting telescopes can have their own issues and problems as well. One problem can be the size of reflecting telescopes. As larger and larger mirrors are used, the telescopes have to grow in size to fit the mirrors inside. While you get better results with the larger reflecting telescopes, they are not very portable and it can be difficult to find a place to keep them when you are not using them.

Another problem is that reflecting telescopes may need to have the mirrors adjusted from time to time to keep them working perfectly and to maximize the light that is captured.

Should I Buy a Reflecting Telescope Or a Refracting Telescope?

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