Технические характеристики
- Lens Type Cylindrical
- Lens Shape Plano-Concave
- Size 50.8 x 25.4 mm
- Center Thickness (Tc) 6.0 mm
- Edge Thickness (Te) 7.97 mm
- Lens Material Grade A N-BK7
- Antireflection Coating Uncoated
- Surface Quality 40-20 scratch-dig
- Surface Flatness &lambda,/2-&lambda,/4
- Surface Accuracy, Irregularity, X Axis &le,&lambda,/4 per cm
- Surface Accuracy, Irregularity, Y Axis &le,&lambda,/2
- Effective Focal Length (EFL) -75.0 mm
- Back Focal Length (BFL) -78.96 mm
- Thickness 6.0 mm
- Centration
- Principal Plane 2 (P2) -3.96 mm
- Radius of Curvature (R) -38.770 mm
- Size Tolerance ±0.1 mm
- Focal Length Tolerance ± 2.0%
- Center Thickness Tolerance +0.5/-0.25 mm
- Edge Thickness Tolerance ±0.3 mm
- Wedge
- Clear Aperture &ge,central 80% of dimensions
- Chamfers 0.5 mm face width
- Chamfers Angle/Tolerance 45°, typical
- f/Y -3
- Cleaning See How to Clean Optics
