Indian Astronomical Supplies

Telescopes & Types Of Telescopes












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TELESCOPES :
 
 It's easy to look at the spectacular photos in astronomy books and let your expectations soar. Most of the photos in books are taken with extremely large telescopes in the middle of Australia or Mexico or Hubble space telescope.
  Having said that a good small telescope can capture a lot of beautiful celestial sights.
 
you will be able to view the moon and go crater hopping, you will be able to see Jupiter with its largest four moons strung out alongside it, Saturn and it's unmistakable rings, the ever changing crescent of Venus and the fiery red of Mars. You will be able to see nebula, star clusters and the Great Andromeda galaxy that lies about 2m light years beyond our own galaxy, the Milky Way.
 
Types  of  Telescopes
 
 Refractor Telescopes :
 
Refractors (also known as dioptrics) are what the average person identifies with the word "telescope", a long, thin tube where light passes in a straight line from the front objective lens directly to the eyepiece at the opposite end of the tube.
Advantages
  • Easy to use and reliable due to the simplicity of design.
    Little or no maintenance.
  • Excellent for lunar, planetary and binary star observing especially in larger apertures.
  • Good for distant terrestrial viewing.
  • High contrast images with no secondary mirror or diagonal obstruction.
  • Color correction is good in achromatic designs and excellent in apochromatic, fluorite, and ED designs.
  • Sealed optical tube reduces image degrading air currents and protects optics.
    Objective lens is permanently mounted and aligned.  
 
Continued.............  Disadvantages of Refractors