Plano-Convex Lens, ValuMax, N-BK7, 25.4 mm, 400 mm EFL, 400-700 nm

The KPX618-C N-BK7 Plano-Convex Lens is a 400-700 nm anti-reflection coated, 25.4 mm diameter N-BK7 plano-convex lens with an effective focal length of 400 mm. It has = λ/2 surface irregularity, 60-40 scratch-dig. N-BK7 is an excellent material for most visible and near infrared applications. It is the most common optical glass, and it provides great performance at a good value.

Specifications

Technical Specs

Lens Shape
Plano-Convex
Diameter
25.4 mm
Lens Material
N-BK7
Antireflection Coating
400-700 nm
Coating Type
Visible Single-Layer MgF₂
Coating Code
-C
Damage Threshold
7 J/cm², 10 ns pulses, 20 Hz at 532 nm
Surface Quality
60-40 scratch-dig
Surface Accuracy, Irregularity
λ/2
Surface Accuracy, Power
2.5 λ
F/#
15.7
Effective Focal Length (EFL)
400 mm
Back Focal Length (BFL)
397.77 mm

Edge Thickness (Te)
3.0 mm
Center Thickness (Tc)
3.39 mm
Principal Plane 2 (P2)
-2.23 mm
Design Wavelength
546.1 nm
Centration
≤3 arc min
Chamfers
0.25-0.75 mm
Chamfers Angle/Tolerance
45° ±15°, typical
Focal Length Tolerance
±2 %
Diameter Tolerance
+0/-0.15 mm
Center Thickness Tolerance
±0.2 mm
Clear Aperture
≥central 90% of diameter
Cleaning
See How to Clean Optics

Lens Shape
Plano-Convex
Diameter
25.4 mm
Lens Material
N-BK7
Antireflection Coating
400-700 nm
Coating Type
Visible Single-Layer MgF₂
Coating Code
-C
Damage Threshold
7 J/cm², 10 ns pulses, 20 Hz at 532 nm
Surface Quality
60-40 scratch-dig
Surface Accuracy, Irregularity
λ/2
Surface Accuracy, Power
2.5 λ
F/#
15.7
Effective Focal Length (EFL)
400 mm
Back Focal Length (BFL)
397.77 mm

Edge Thickness (Te)
3.0 mm
Center Thickness (Tc)
3.39 mm
Principal Plane 2 (P2)
-2.23 mm
Design Wavelength
546.1 nm
Centration
≤3 arc min
Chamfers
0.25-0.75 mm
Chamfers Angle/Tolerance
45° ±15°, typical
Focal Length Tolerance
±2 %
Diameter Tolerance
+0/-0.15 mm
Center Thickness Tolerance
±0.2 mm
Clear Aperture
≥central 90% of diameter
Cleaning
See How to Clean Optics

Resources & Downloads

3D Product Models

2D Product Drawings

KPX618_ZEMAX(961 B, ZIP)

Other

KPX618-C RoHS Certificate(709.1 kB, PDF)
MgF₂ Raw Data.xlsx(63.2 kB, XLSX)

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