Negative Achromatic Doublet Lens, Visible, 12.5 mm, -35 mm EFL, 400-700 nm

The NAC025 Visible Negative Achromatic Doublet Lens is a 400 to 700 nm antireflection coated, 12.5 mm diameter, N-BK7 and N-SF5 precision achromatic doublet lens with an effective focal length of -35 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.

Specifications

Technical Specs

Lens Type
Negative Achromatic Doublet
Lens Shape
Bi-Concave
Diameter
12.5 mm
Antireflection Coating
400-700 nm
Coating Type
Visible Single-Layer MgF₂ (R_avg≤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)
-35 mm
Back Focal Length (BFL)
-36.51 mm
F/#
2.8
Radius of Curvature (R)
-21.66 mm

Radius 2
17.48 mm
Radius 3
50.54 mm
Edge Thickness (Te)
4.74 mm
Center Thickness (Tc)
3.56 mm
Design Wavelengths
587.6 nm
Centration
<1 arc min
Diameter Tolerance
+0/-0.025 mm
Focal Length Tolerance
±2%
Center Thickness Tolerance
±0.2 mm
Clear Aperture
11.5 mm

Lens Type
Negative Achromatic Doublet
Lens Shape
Bi-Concave
Diameter
12.5 mm
Antireflection Coating
400-700 nm
Coating Type
Visible Single-Layer MgF₂ (R_avg≤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)
-35 mm
Back Focal Length (BFL)
-36.51 mm
F/#
2.8
Radius of Curvature (R)
-21.66 mm

Radius 2
17.48 mm
Radius 3
50.54 mm
Edge Thickness (Te)
4.74 mm
Center Thickness (Tc)
3.56 mm
Design Wavelengths
587.6 nm
Centration
<1 arc min
Diameter Tolerance
+0/-0.025 mm
Focal Length Tolerance
±2%
Center Thickness Tolerance
±0.2 mm
Clear Aperture
11.5 mm

Resources & Downloads

3D Product Models

Download CAD Files

Other

NAC025_ROHS2-2021.pdf(282.4 kB, PDF)
MgF₂ Raw Data.xlsx(63.2 kB, XLSX)

Software

NAC025 ZEMAX(279.3 kB, ZIP)

2D Product Drawings

Negative Achromats Doublet Drawing(754.3 kB, PDF)

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