ValuMax Plano-Convex Lens, N-BK7, 25.4 mm Diameter, 450 mm EFL, 400-700 nm

The KPX621-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 450 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/#
17.7
Effective Focal Length (EFL)
450 mm
Back Focal Length (BFL)
447.80 mm
Radius of Curvature (R)
233.424 mm

Edge Thickness (Te)
3.0 mm
Center Thickness (Tc)
3.35 mm
Principal Plane 2 (P2)
-2.20 mm
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/#
17.7
Effective Focal Length (EFL)
450 mm
Back Focal Length (BFL)
447.80 mm
Radius of Curvature (R)
233.424 mm

Edge Thickness (Te)
3.0 mm
Center Thickness (Tc)
3.35 mm
Principal Plane 2 (P2)
-2.20 mm
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

Software

KPX621_ZEMAX(965 B, ZIP)

Other

KPX621-C RoHS Certificate(706.9 kB, PDF)
MgF₂ Raw Data.xlsx(63.2 kB, XLSX)

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