This video provides an in-depth look at the unusual Zeiss 2.5x Glasvizier 16 bifocal scope used on German WWI rifles. It explains the optic's functionality, comparing it to modern SeeAll sights, and highlights its unique clip-on design that avoids permanent rifle modification. The presenter speculates on its limited field use due to its unorthodox nature and rarity, noting that surviving examples are scarce. The video also offers a link to purchase modern SeeAll sights for those interested in the concept.
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