Unbranded Straight Through Porro Prism (1.25") (Pre-owned)

Porro Prism Design: The Porro prism is a type of optical prism used to rectify an inverted or reversed image. It's often used in binoculars and spotting scopes to provide a more compact design while maintaining optical performance. The Porro prism design typically involves two right-angled prisms arranged parallel to each other, with the hypotenuse faces facing each other.

Straight Through Configuration: The term "Straight Through" indicates that the optical path through the prism is linear, with light entering one end of the prism and exiting the other end in a straight line. This configuration is common in certain types of spotting scopes and astronomical telescopes where a direct, unobstructed view is desired.

1.25" Diameter: The designation "1.25"" refers to the diameter of the barrel or housing where the Porro prism is housed. In the context of telescopes, this size is commonly associated with eyepieces and accessories that use the 1.25-inch standard format, which is prevalent in amateur astronomy.

Usage: The Straight Through Porro Prism (1.25") is often used in spotting scopes and certain types of astronomical telescopes, particularly those designed for terrestrial observation or wide-field astronomical viewing. It helps to maintain the correct orientation of the image and provides a straight-through optical path for comfortable viewing.

Compatibility: Since the 1.25-inch format is a standard in the amateur astronomy community, optical components such as eyepieces, Barlow lenses, and other accessories designed to fit this format can be used with telescopes equipped with a Straight Through Porro Prism (1.25").