The NAC016 Visible Negative Achromatic Doublet Lens is a 400 to 700 nm antireflection coated, 6.35 mm diameter, N-BAF10 and N-SF10 precision achromatic doublet lens with an effective focal length of -25 mm. The negative achromats are commonly used for expanding the beam diameter, increasing focal length and increasing the magnifications of an optical system. This negative achromat is computer designed to effectively minimize spherical aberration and coma when operating at infinite conjugate ratio. Unlike singlet lenses, this results in a constant focal length independent of aperture and far better off-axis performance. Achromats are superior to singlet lenses for monochromatic applications at any visible wavelength.
Технические характеристики
- Lens Type Negative Achromatic Doublet
- Lens Shape Bi-Concave
- Diameter 6.35 mm
- Antireflection Coating 400-700 nm
- Coating Type Visible Single-Layer MgF2 (Ravg≤1.75% )
- Lens Material N-BAF10/N-SF10
- Surface Quality 40-20 scratch-dig
- Surface Accuracy, Irregularity λ/4
- Surface Accuracy, Power 1.5 λ
- Effective Focal Length (EFL) -25 mm
- Back Focal Length (BFL) -26.53 mm
- F/# 4
- Radius of Curvature (R) -17.57 mm
- Radius 2 11.48 mm
- Radius 3 109.44 mm
- Edge Thickness (Te) 3.27 mm
- Center Thickness (Tc) 3 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 5.625 mm
