| 1. | It is a variant of the more common double Porro prism configuration.
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| 2. | Roof-prisms designs create an instrument that is narrower and more compact than Porro prisms.
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| 3. | Porro prism binoculars do not split beams and therefore they do not require any phase coatings.
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| 4. | Porro prisms binoculars occasionally need their prism sets to be re-aligned to bring them into collimation.
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| 5. | Porro prisms are most often used in pairs, forming a "'double Porro prism " '.
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| 6. | Porro prisms are most often used in pairs, forming a "'double Porro prism " '.
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| 7. | Galilean designs were widely used up to the end of the 19th century when they gave way to porro prism types.
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| 8. | An image travelling through a Porro prism is rotated by 180?and exits in the opposite direction offset from its entrance point.
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| 9. | Therefore, to reduce the cost of production for a porro prism, the edge of the roof is usually left out.
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| 10. | While a single porro prism can be constructed to work as well as a roof prism, it is seldom used as such.
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