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TECHSPEC^® components are designed, specified, or manufactured by Edmund Optics. Learn More

12.5mm Dia x -20mm FL Negative Doublet Lens MgF₂ Coated

Name: 12.5mm Dia x -20mm FL Negative Doublet Lens MgF 2 Coated
Brand: TECHSPEC
SKU: 62-475
Price: ₹7,134

Stock #62-475 10 to 12 days Other Coating Options

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₹7,134

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₹7,134

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₹5,699

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Diameter (mm):

12.50 +0.0/-0.025

Effective Focal Length EFL (mm):

-20.00

Focal Length Tolerance (%):

±1

Back Focal Length BFL (mm):

-22.88

Focal Length Specification Wavelength (nm):

587.6

Clear Aperture CA (mm):

11.50

Centering (arcmin):

Center Thickness CT (mm):

5.50 ±0.10

Center Thickness CT 1 (mm):

2.00 ±0.05

Center Thickness CT 2 (mm):

3.50 ±0.05

Radius R₁ (mm):

-13.80

Radius R₂ (mm):

9.99

Radius R₃ (mm):

109.48

Edge Thickness ET (mm):

7.01

N-BAF10 / N-SF10

Surface Quality:

40-20

f/#:

1.6

Numerical Aperture NA:

0.31

Coating:

MgF₂ (400-700nm)

Coating Specification:

R_avg ≤1.75% @ 400 - 700nm

Power (P-V) @ 632.8nm:

1.5λ

Irregularity (P-V) @ 632.8nm:

λ/4

Bevel:

Protective bevel as needed

Type:

Negative Achromatic Lens

Wavelength Range (nm):

400 - 700

Regulatory Compliance

RoHS 2015:

Compliant

Reach 219:

Compliant

Certificate of Conformance:

View

Product Family Description

Magnesium Fluoride (MgF₂) Coating
Used to Extend Focal Length
Broadband AR Coated Negative Achromatic Lenses Also Available

TECHSPEC® MgF₂ Coated Negative Achromatic Lenses consist of two optical elements cemented together. Negative doublet lenses are corrected for color and on-axis aberrations. TECHSPEC MgF₂ Coated Negative Achromatic Lenses are used predominantly as Barlow lenses to extend focal lengths. These lenses are often combined with positive achromatic mirror systems and imaging lenses.