uncoated-n-bk7-bi-concave-lenses

Uncoated N-BK7 Bi-Concave Lenses

Specifications

Technical Specs

Lens Shape
Bi-Concave (Double-Concave)
Lens Material
N-BK7
Antireflection Coating
Uncoated
Surface Quality
40-20 scratch-dig
Surface Accuracy, Irregularity
λ/4
Surface Accuracy, Power
1.5 λ
Centration
≤3 arc min
Chamfers
0–0.8 mm face width

Chamfers Angle/Tolerance
45° ±15°, typical
Focal Length Tolerance
±1 %
Diameter Tolerance
+0/-0.1 mm
Center Thickness Tolerance
±0.1 mm
Clear Aperture
≥central 90% of diameter
Cleaning
See How to Clean Optics

Lens Shape
Bi-Concave (Double-Concave)
Lens Material
N-BK7
Antireflection Coating
Uncoated
Surface Quality
40-20 scratch-dig
Surface Accuracy, Irregularity
λ/4
Surface Accuracy, Power
1.5 λ
Centration
≤3 arc min
Chamfers
0–0.8 mm face width

Chamfers Angle/Tolerance
45° ±15°, typical
Focal Length Tolerance
±1 %
Diameter Tolerance
+0/-0.1 mm
Center Thickness Tolerance
±0.1 mm
Clear Aperture
≥central 90% of diameter
Cleaning
See How to Clean Optics

Resources & Downloads

Technical Notes

Selection Guides

Spherical Lens Guide