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  Binoculars: Astronomy: Binoculars - Prism-TYPES OF PRISMS
Posted on Monday, November 29 @ 02:25:46 CST by astronomy
 
 
  Binoculars

TYPES OF PRISMS

Binoculars are made with one of two types of internal prism: porro prisms or roof prisms. Porro-prism binoculars, the most common type, have a zigzag shape. They are the best choice for skywatchers.



Roof-prism binoculars have a compact "straight-through" shape and cost more than the most expensive models, however, binoculars with roof prisms exhibit spikes of light on bright stars, making them unsuitable for astronomy.

 
 
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