Tangent Theta Incorporated in Nova Scotia, Canada Tangent Theta was created to design and build rifle scopes for professional marksmen. The goal is to produce rifle scopes that are beyond reproach in design, performance, and clarity. For assistance with Tangent Theta rifle scopes or if you have any questions about Tangent Theta, please call us at (570)419-0078. . We’re an authorized Tangent Theta Dealer and carry a large amount of inventory for immediate shipment!