Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 38.1 mm EFL, Uncoated

The KBX139 N-BK7 Bi-Convex Lens is an uncoated, 2 inch (50.8 mm) diameter, N-BK7 bi-convex lens with an effective focal length of 38.1 mm. It is designed to meet the demanding requirements of laser electro-optic applications. Newport's N-BK7 precision bi-convex lenses are manufactured from fine annealed optical glass and are polished to tight tolerances using master test plates to ensure minimum wavefront distortion.

Specifications

Technical Specs

Lens Shape
Bi-Convex
Diameter
50.8 mm
Lens Material
N-BK7
Antireflection Coating
Uncoated
Surface Quality
40-20 scratch-dig
Surface Accuracy, Irregularity
λ/4
Surface Accuracy, Power
1.5 λ
F/#
0.7
Effective Focal Length (EFL)
38.1 mm
Back Focal Length (BFL)
28.54 mm
Radius of Curvature (R)
34.442 mm
Edge Thickness (Te)
3.0 mm
Center Thickness (Tc)
25.360 mm

Principal Plane 1 (P1)
9.55 mm
Principal Plane 2 (P2)
-9.55 mm
Design Wavelength
589 nm
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-Convex
Diameter
50.8 mm
Lens Material
N-BK7
Antireflection Coating
Uncoated
Surface Quality
40-20 scratch-dig
Surface Accuracy, Irregularity
λ/4
Surface Accuracy, Power
1.5 λ
F/#
0.7
Effective Focal Length (EFL)
38.1 mm
Back Focal Length (BFL)
28.54 mm
Radius of Curvature (R)
34.442 mm
Edge Thickness (Te)
3.0 mm
Center Thickness (Tc)
25.360 mm

Principal Plane 1 (P1)
9.55 mm
Principal Plane 2 (P2)
-9.55 mm
Design Wavelength
589 nm
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

Related Products

Similar

Description	Compatibility	Avail.	Price
CKX038Cylindrical Lens, Plano-Convex, N-BK7, 50.8x25.4 mm, 38.1 mm, Uncoated	UNIVERSAL	In Stock	$261
SPX015Plano-Convex Lens, Fused Silica, 25.4 mm, 38.1 mm EFL, Uncoated	UNIVERSAL	Contact Us FREE 2-day shipping on thousands of products on Newport.com Learn More	$190
KPX019Plano-Convex Lens, N-BK7, 6.35 mm Diameter, 25.4 mm EFL, Uncoated	UNIVERSAL	In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More	$33
KBX079Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 250 mm EFL, Uncoated	UNIVERSAL	In Stock	$44

Compatible

Description	Compatibility	Avail.	Price
VLH-3AV-Groove Lens Holder, 0.60 to 3.60 in. Diameter Lenses	UNIVERSAL	In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More	$180
LP-2APrecision Lens Positioner, 2.0 in., 100 TPI XYθXθY, 80 TPI Z	UNIVERSAL	In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More	$1,110
LCM-2Lens Mount, Self-Centering, 0.125-2.375 in. Diameter Lenses	IMPERIAL	In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More	$305
M-LH-2AFixed Lens Mount, Ø2.0 in. (50.8 mm), M4 Thread, A-LINE	METRIC	In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More	$37
AC-2AVariable Size Lens Mount, 17.8-57.1 mm, Thumbscrew Support Arms	UNIVERSAL	In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More	$78
LH-2AFixed Lens Mount, 2.0 in. (50.8 mm), 8-32 Thread, A-LINE	IMPERIAL	In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More	$37
LT20-30Lens Tube, 2 inch dia. LT Series, 3 inch length	UNIVERSAL	In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More	$48