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What Is A BAK-4 Prism?
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Roof Prism vs Porro Prism Binoculars? BK7 vs BAK4? [Glass 101]
BinocularSky - The Minefield: Advertising Hype in Binoculars
![Roof Prism vs Porro Prism Binoculars? BK7 vs BAK4? [Glass 101]](https://www.targettamers.com/wp-content/uploads/2016/09/Roof_Prism_Binoculars.png "Roof Prism vs Porro Prism Binoculars? BK7 vs BAK4? [Glass 101]")
Roof Prism vs Porro Prism Binoculars? BK7 vs BAK4? [Glass 101]
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