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Edmund Optics 35-157 Cr Series Fixed Focal Length Lenses Cables Midwest Optical Systems AC400-55 AcrylicEdmund Optics 35 157 Cr Series Fixed Focal Length Lenses 12mm Cr Series Lens, F4. 0 TECHSPEC Compact Ruggedized (Cr) Series Fixed Focal Length Lenses provide Stabilized Ruggedization, protecting the lens from damage while maintaining optical pointing and positioning after shock and vibration. All individual lens elements are glued in place to reduce object shift on the image. In addition, these lenses feature robust mechanics with a simplified focus