1A reflecting prism in which the light is reflected on two 45° surfaces and returned parallel to the incoming beam.
波罗棱镜。比较ROOF PRISM
Compare with roof prism
Example sentencesExamples
Bushnell's latest couples a waterproof 8x36 porro prism center-focus binocular with a laser rangefinder.
While not as sexy as a roof prism, the porro prism is a dependable unit made for the outdoors.
In binoculars, it has added porro prisms to its line.
Modern roof prism designs are capable of performance just as good as a comparable porro prism design, due to current technology such as phase coating and improved reflective backing materials on the prisms.
Two porro prism binocular models are new, the 8x42 mm and the 10x42 mm.
1.1A pair of binoculars using two Porro prisms at right angles, resulting in a conventional instrument with objective lenses that are further apart than the eyepieces.
波罗棱镜双筒望远镜
Origin
Named after the Italian scientist Ignazio Porro (1801–75).