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Edmund Optics 25078 Rugged Blue Series M12 Lenses 1/2" Varifocal Lens Midwest Optical Systems BN660-58 NarrowEdmund Optics 25078 Rugged Blue Series M12 Lenses 25mm f 2. 5 Blue M12 Ruggedized IR Cut TECHSPEC Rugged Blue Series M12 Lenses havestabilized ruggedization, protecting the lens from damage, while reducing pixel shift and maintaining optical pointing stability after shock and vibration. Each lens consists of several precision glass optics that are glued in place inside a compact, aluminum housing. Gluing the glass optics prevents even the smallest