Telescopes

Telescopes are widgets that are employed to view the distant objects. They find it is use in astronomy and physics. It enables you to view the distant objects by magnifying them. There are numerous types of telescopes and their prices vary according to the specifications. Many accessaries are likewise available that may be used in conjunction with the telescopes. Small telescopes that are applied as toys are likewise competent of watching a great deal of objects around 50 meters away.

Principle in which the telescope works

The principle in which the telescope works is very simple. There are two lenses that make up the task of watching the objects that are at a distance. One of the lenses picks up the light from the object viewed and makes it available at a focus point. Another lens picks up the bright light from the focus point and spreads it out to your retina so that you may view. The lens that picks up the light from the object is called the goal to be attained lens or crucial mirror. The lens that picks up the light from the focal point is called the eyepiece lens.

Factors that affect the watching of the object

The capability of the telescope to gather the light from the object that is viewed and the capability to enlarge the effigy are the elements that affect the efficacy of the telescope. The capability to gather light from the object depends on the diameter of the lens or mirror, which is other than as supposed or expected called the aperture. The more prominent the aperture the more the light it may collect. Enlarging of an effigy depends on the combining of the lenses that are used. The eyepiece in the telescope performs the magnification.

Some of the world’s greatest optical telescopes in operation

We say a telescope to be more spectacular based on the aperture size. Based on this we may say that Keck and Keck II are the biggest telescopes in operation with an aperture of 10 meters diameter. The Keck telescope is composed of 36 mirror segments. This is located at Mauna Kea, Hawaii. The next biggest is Hobby-Eberly located at Mt. Fowlkes, Texas which has an aperture of 9.2 meters. You may get a list of the greatest optical telescopes at http://astro.nineplanets.org/bigeyes.html.

Choosing your telescope

The choice of the telescope for the most part depends on what you want to observe. You may choose compound telescopes and refractor type of telescope for observing through the urban skies. For the rural skies, you may use compound telescopes and reflectors. They are better than the refractors type of telescopes. Each type has it is own vantages and disadvantages. Hence, a great deal of people have dissimilar telescope for dissimilar purposes.

If you’re looking for a dual-purpose telescope suitable for both terrestrial and celestial viewing, then the AstroMaster Series is for you. Each AstroMaster model is competent of giving rectify views of land and sky.

General Features:

• Quick and easy no-tool setup
• Permanently mounted StarPointer
  

Erect effigy optics – Ideal for terrestrial and astronomical use

Quick release dovetail attachment – no tool setup

Pan handle Alt-Az control with clutch – for smooth and precise pointing

The AstroMaster Series construct bright, clear images of the Moon and planets. It is easy to see the moons of Jupiter and the rings of Saturn with each one of these fine instruments. For views of the more magnificent deep space objects like galaxies and nebulae, we commend the more prominent aperture and light gathering capacity of the Newtonian reflectors.

Specs

• Optical Design: Refractor
• Aperture: 70 mm (2.76 in)
• Focal Length: 900 mm (35.43 in)
• Focal Ratio: 12.86
• Eyepiece 1: 20 mm (0.79 in)
• Magnification 1: 45 x
• Eyepiece 2: 10 mm (0.39 in)
• Magnification 2: 90 x
• Mount: Altazimuth
• Optical Coatings: Fully Coated
• Weight: 18 lb (8.16 kg)
• Finderscope: Built-on StarPointer
• Tube Attachment: Dovetail Bar
• Star Diagonal: Erect Image Diagonal – 1.25″
• Tripod: 1.25″ steel tube legs
• CD ROM: The Sky L1
• Highest Useful Magnification: 165 x
• Limiting Stellar Magnitude: 11.7
• Resolution (Rayleigh): 1.99 arcsec
• Resolution (Dawes): 1.66 arcsec
• Light Gathering Power: 100 x
• Angular Field of View: 1.1 °
• Linear Field of View (@1000 yds): 58 ft (17.68 m)
• Optical Tube Length: 36 in (914.4 mm)

2-year Telescope Warranty

CELESTRON TWO YEAR LIMITED WARRANTY

A. Celestron warrantees your telescope to be free from defects in materials and workmanship for two years. Celestron will fix or replace such product or share thereof which, upon inspection by Celestron, is found to be defective in materials or workmanship. As a condition to the obligation of Celestron to fix or replace such product, the product ought to be returned to Celestron together with proof-of-purchase worthy of acceptance or satisfactory to Celestron.

B. The Proper Return Authorization Number ought to be received from Celestron in advance of return. Call Celestron at (310) 328-9560 to receive the number to be displayed on the outside of your shipping container.

All returns must be accompanied by a written statement setting forth the name, address, and daytime telephone number of the owner, together with a brief description of any claimed defects. Parts or product for which substitute is made shall become the property of Celestron.

The client shall be responsible for all costs of transportation and insurance, both to and from the factory of Celestron, and shall be required to prepay such costs.

Celestron shall use reasonable attempts to fix or replace any telescope covered by this warranty within thirty days of receipt. In the event repair or substitute shall require more than thirty days, Celestron shall notify the client accordingly. Celestron reserves the right to replace any product which has been discontinued from it is product line with a new product of comparable value and function.

This warranty shall be void and of no strength of effect in the event a covered product has been altered in design or function, or subjected to abuse, misuse, mishandling or unauthorized repair. Further, product malfunction or deterioration due to normal wear is not covered by this warranty.

CELESTRON DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WHETHER OF MERCHANTABILITY OF FITNESS FOR A PARTICULAR USE, EXCEPT AS EXPRESSLY SET FORTH HEREIN. THE SOLE OBLIGATION OF CELESTRON UNDER THIS LIMITED WARRANTY SHALL BE TO REPAIR OR REPLACE THE COVERED PRODUCT, IN ACCORDANCE WITH THE TERMS SET FORTH HEREIN. CELESTRON EXPRESSLY DISCLAIMS ANY LOST PROFITS, GENERAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES WHICH MAY RESULT FROM BREACH OF ANY WARRANTY, OR ARISING OUT OF THE USE OR INABILITY TO USE ANY CELESTRON PRODUCT. ANY WARRANTIES WHICH ARE IMPLIED AND WHICH CANNOT BE DISCLAIMED SHALL BE LIMITED IN DURATION TO A TERM OF TWO YEARS FROM THE DATE OF ORIGINAL RETAIL PURCHASE.

Some states do not concede the exclusion or limitation of incidental or consequential damages or limitation on how long an implied warranty lasts, so the above limitations and exclusions may not utilise to you.

This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

Celestron reserves the right to alter or discontinue, without prior observe to you, any model or style telescope.

If warranty difficultnesses arise, or if you need assistance in using your telescope contact:

Celestron
Customer Service Department
2835 Columbia Street
Torrance, CA 90503
Tel. (310) 328-9560
Fax. (310) 212-5835

Monday-Friday 8AM-4PM PST

NOTE: This warranty is valid to U.S.A. and Canadian clients who have purchased this product from an authorized Celestron merchandiser in the U.S.A. or Canada. Warranty outside the U.S.A. and Canada is valid only to clients who purchased from a Celestron’s International Distributor or Authorized Celestron Dealer in the specific country. Please contact them for any warranty service.