Encyclopedia > Spotting scope

  Article Content

Spotting scope

A spotting scope is a portable telescope, optimized for the observation of terrestrial objects. The magnification[?] of a spotting scope is typically on the order of 20X to 30X. Other common features include:
  • somewhat "rugged" or rubber-armoured design
  • convenient mounting for attaching to a tripod
  • ergonomically-designed and located knob for focus control
  • tethered elastomeric lens cap
  • a range of eyepieces to give different magnifications, or a variable "zoom" eyepiece to give a range of magnifications, eg 20-60X

The light gathering power of a spotting scope is decided by the width of the objective lens, typically 55-80mmm. the larger the objective, the more expensive the telescope.

The choice of the eyepiece lens determines the overall magnification. The best magnification is decided by a number of factors.

A magnification less than 20x is pointless, since binoculars would do. If more than 60x, the brightness is poorer, and, even on a tripod, shake can be a problem. The field of view is also limited.

Ususally for birding, 20x or 30x is favoured. This gives a good field of view and a bright image.



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Rameses

... of several Egyptian pharaohs: Ramses I[?] Ramses II ("The Great") Ramses III Ramses IV[?] The name means "Child of the Sun". This is a disambiguation page; ...

 
 
 
This page was created in 24.7 ms