28mm EFL Unmounted, RKE Precision Eyepiece

Product Details Full Prescription Data Available Long Eye Relief Apparent Field of 45° The RKE line of eyepieces is one of our most popular designs. Originally produced for telescope use, over time they have proven useful in a wide variety of industrial and medical applications. In addition, to help customers take advantage of the powerful current optical design software, we are pleased to forward full prescription data for these eyepieces. Prescription information available upon request. Please complete a Request for Prescription Form . Unmounted RKE Eyepieces include the eye Lens, field Lens, and black anodized spacer between the 2 lenses. Unmounted configurations are designed to provide OEMs with the components required to integrate these eyepieces into customer-designed applications. Specifications General Type: Unmounted Manufacturer: Edmund Optics Physical & Mechanical Properties Eye Relief (mm): 24.50 Center Air Spacing (mm): 1.320 Total Length, Glass Only (mm): 22.34 Housing Length (mm): N/A Image Distance (mm): 15.485 Optical Properties Distortion (%): 5 (Specified @ 0.7 Field) Effective Focal Length EFL (mm): 28.00 Field Stop Diameter (mm): 23.3 Apparent Field (°): 45.00 Back Focal Length BFL (mm): 15.67 Lateral Color, 0.7 Field : 0.018 Spot Size (μm): 3/12 (On-Axis/0.7 Field) Regulatory Compliance Certificate of Conformance: View ×