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At a glance: advantages and disadvantages of different telescope designs


Refractor:

Advantages:

  1. Good, classic design
  2. No Obstruction
  3. Good Contrast
  4. Adjustment almost never necessary
  5. No thermal deterioration

Disadvantages:

  1. Expensive when have large apertures
  2. Bulky when refractor is too big
  3. Unless corrected, colour aberration and blurriness can occur

 

Newton:

Advantages:

  1. Cheap to produce
  2. Larger apertures possible
  3. No colour aberration
  4. Good contrast
  5. Only a low level of obstruction
  6. Lightweight
  7. Many variations available
  8. Dobson also possible

Disadvantages:

  1. Aperration according to aperture ratio
  2. Lower contrast than with refractors of the same aperture (because of obstruction)
  3. Because they are not closed systems, thermal air flows can occur which impair the image
  4. You have to adjust it every now and then
  5. More sensitive to dirt than a closed system

 

Maksutov:

Advantages:

  1. Shorter body length
  2. Almost no colour aberration
  3. Closed design so no thermal deterioration
  4. Good correction of aberration
  5. Very good contrast
  6. No secondary mirror struts
  7. Less expensive telescopes are available

Disadvantages:

  1. Heavy because of Meniskus lenses
  2. Long cooling time
  3. Large apertures (over 8") can be expensive
  4. Obstruction occurs due to secondary mirror
  5. Small fields of view when aperture ratio of around f/13

 

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17.04.2014


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