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Edmund Optics 36-840 Cr Series Fixed Focal Length Lenses Longpass Filter Midwest Optical Systems AC800-39 AcrylicEdmund Optics 36 840 Cr Series Fixed Focal Length Lenses 8. 5mm Cr Series Lens, F2. 8 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