Технические характеристики
- Lens Type Negative Achromatic Doublet
- Lens Shape Bi-Concave
- Diameter 12.5 mm
- Antireflection Coating 400-700 nm
- Coating Type Visible Single-Layer MgF2 (Ravg≤1.75% )
- Lens Material N-BK7/N-SF5
- Surface Quality 40-20 scratch-dig
- Surface Accuracy, Irregularity λ/4
- Surface Accuracy, Power 1.5 λ
- Effective Focal Length (EFL) -50 mm
- Back Focal Length (BFL) -51.58 mm
- F/# 4
- Radius of Curvature (R) -30.83 mm
- Radius 2 23.47 mm
- Radius 3 69.20 mm
- Edge Thickness (Te) 4.40 mm
- Center Thickness (Tc) 3.56 mm
- Design Wavelengths 587.6 nm
- Centration
- Diameter Tolerance +0/-0.025 mm
- Focal Length Tolerance ±2%
- Center Thickness Tolerance ±0.2 mm
- Clear Aperture 11.5 mm
